Jeremy Ethier

40 Episodes
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By: Jeremy Ethier

Welcome to my podcast! I'm a science-based fitness researcher, YouTuber, and founder of Built With Science. On this podcast you'll find a mix of training and nutrition tips based on the latest advances in scientific research.

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Targeting Belly Fat Is... Possible?! (NEW Study)
Targeting Belly Fat Is... Possible?! (NEW Study) episode artwork
Yesterday at 10:47 PM

Can you actually target belly fat? For 60 days, we put the most popular belly fat workout advice to the test — running a real experiment on how to lose belly fat using exercises to lose belly fat like targeted ab training, and measuring every result with MRI, one of the most precise ways to track changes in fat and muscle. If you've ever wondered whether belly fat loss exercise routines actually work, this is the clearest answer we could produce.
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How Running Completely Changes The Human Body
How Running Completely Changes The Human Body episode artwork
Last Tuesday at 10:21 PM

I did 30 minutes of cardio a day (running every day for 30 days) while still lifting to settle the debate every lifter has: does cardio kill gains? It comes down to questions like cardio before or after weights, whether cardio and weight training can coexist, the problems with running vs lifting, and the two fears that keep people from running at all — is cardio bad for muscle gain, and does running make you lose muscle? To find out, I tested my VO2 max, got an MRI body scan, used a DXA scan, and trained for Hyrox.
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It's Weird, But It Re-Builds Your Tendons In 30 Days
It's Weird, But It Re-Builds Your Tendons In 30 Days episode artwork
Last Monday at 9:56 PM

If your knee pain, elbow pain, or shoulder pain keep clicking, aching, or getting re-injured, the real problem may be your tendons. This tendon rehab guide covers the two biggest mistakes that weaken them and the isometric tendon exercises that strengthen weak tendons, potentially in as little as 30 days, plus tendon pain relief, tendon recovery, and injury prevention.
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I Proved My 6-Pack Abs Diet Works For ANYONE
I Proved My 6-Pack Abs Diet Works For ANYONE episode artwork
Last Sunday at 9:49 PM

What happens when you swap diets with someone three times your size — and what can it teach you about how to stop overeating? I put the best strategies to stop overeating to the test, building science-backed tips to stop overeating into a full day of real meals.
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I Proved (Almost) Everyone Is Wasting Time In The Gym
I Proved (Almost) Everyone Is Wasting Time In The Gym episode artwork
Last Saturday at 9:42 PM

How many days a week should you work out to build muscle — and is a 6-day workout plan in the gym actually better than training 3 days a week? We put over 200 lifters through a 10-week experiment comparing a 3-day vs 6-day push/pull/legs split, plus a third group that packed the full 6-day volume into three full-body workouts. The results reveal some important lessons about how often you should work out, how many times a week you should work out each muscle group, and when more training stops paying off.


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It's Dumb, But It Builds Muscle Almost 4x Faster
It's Dumb, But It Builds Muscle Almost 4x Faster episode artwork
10/15/2026

If you've wondered how often to train muscle groups per week, you've heard it: train hard, then take rest days — 48 to 72 hours — for repair and growth. That's the logic behind best training frequency advice, and why choosing to train everyday risks overtraining. But some people do demanding physical work daily and still build unusually muscular bodies. Could removing rest days actually help a muscle grow faster? Could that be the best workout split and best workout routine to build muscle?


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It's Weird, But It Destroys Your Body Fat In 30 Days
It's Weird, But It Destroys Your Body Fat In 30 Days episode artwork
10/14/2026

What if you could lose fat while eating huge meals, never counting calories, and rarely feeling hungry? To test that, I built the world's most filling diet: a volume eating plan that swaps calorie dense foods for high volume low calorie meals and low calorie foods big enough to keep you full in a calorie deficit.


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DOWNLOAD THE FREE 30 DAY GUIDE HERE:http://builtwithscience.com/fillingdiet


Why You Store Fat Here, And How To ACTUALLY Lose It
Why You Store Fat Here, And How To ACTUALLY Lose It episode artwork
10/11/2026

Why does stubborn fat disappear quickly from some areas but refuse to budge from others? In this video, I share how to lose belly fat and other frustrating problem zones, including how to get rid of belly fat around your sides, what to do about lower belly fat, and even how to lose side belly fat that hangs on longest. I rank five of the most stubborn fat-storage areas from easiest to hardest to lose, using real DXA scans, research, and transformations to show why each area behaves differently — and the training and diet strategies that can help.

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It's Weird, But Destroyed Every Ab Exercise I Tested
It's Weird, But Destroyed Every Ab Exercise I Tested episode artwork
10/10/2026

In this video I'm testing 30 popular upper ab exercises, lower ab exercises, and all kinds of ab workouts to find what is actually best.


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Link to ab mat:⁠⁠

https://link.amazon/B08jtBDGe⁠⁠


How to Get Lean in 60 Days (And STAY Lean Forever)
How to Get Lean in 60 Days (And STAY Lean Forever) episode artwork
09/24/2024

How to get lean: The process of getting lean and how to lose fat is actually very simple. It's not easy, but getting a lean body is 100% something anyone can do. If you follow my 3-part plan on how to get lean — from my fat loss diet and fat loss training training, as well as the crucial steps I took to prevent fat regain — I guarantee you’ll get lean fast and, more importantly, maintain your ‘shredded body’ for good.


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How to Build Muscle 2x Faster
How to Build Muscle 2x Faster episode artwork
09/17/2024

What’s the best way to build muscle? Can “bad form” help you build muscle fast? We all know that guy who says he can do 30 pull-ups, and then they’re just half reps. But what if he’s onto a secret about muscle growth? Today, I’ll show you why new research suggests using “bad form” can help you gain muscle almost twice as fast. And it’s actually pretty simple: it’s all about the stretch. Here’s everything to know about the fastest way to build muscle.


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How I Lost My Belly Fat in 7 Days (Science Experiment)
How I Lost My Belly Fat in 7 Days (Science Experiment) episode artwork
08/05/2024

How to lose belly fat in 1 week? Is losing stubborn belly fat 3 times faster even possible? For the next 7 days, I'll be following a science-backed fat loss plan designed to lose belly fat fast. I want to see how my body reacts and if this could be an easy way to achieve weight loss and shred down for the summer.


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The 3 Most Popular Supplements (You Should AVOID)
The 3 Most Popular Supplements (You Should AVOID) episode artwork
07/29/2024

The supplements industry has exploded, reaching almost $400 billion dollars just last year. But how much of the bodybuilding supplements industry is a scam? Protein powder, creatine, multivitamins, athletics greens, BCAA's, fat burners, etc. What gym supplements actually work and what doesn't? Today I’m testing the most popular workout supplements, comparing their claims against real scientific data. I’ll show you what scams to avoid and which gym supplements research says you should use instead. Starting with one that may come as a surprise … creatine.


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What Happens After 30 Days of Taking Steroids?
What Happens After 30 Days of Taking Steroids? episode artwork
05/22/2024

This podcast is for educational purposes only. What would happen if I took steroids for 30 Days? I’m a lifetime natty, but nowadays it seems like so many athletes, actors, and even social media influencers are hopping on steroids. It got me thinking, how serious are steroids side effects? Could I actually use them safely? I wanted to speak to people with first-hand experience. First, I reached out to a bodybuilding veteran to show me the ropes on testosterone.


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How To Get WIDER Biceps
How To Get WIDER Biceps episode artwork
04/30/2024

Is it possible to get wider arms? Isn’t this just genetics? Can you really build wider biceps through your bicep workout? Well, once you understand the anatomy of the short-head biceps and long-head biceps, you'll see it's possible. And after strapping some electrodes to my arm, I found the best exercises you need to include in your biceps workout. Without further ado, here’s how to get wider biceps.


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Targeting Belly Fat Is POSSIBLE?! (New Study)
Targeting Belly Fat Is POSSIBLE?! (New Study) episode artwork
04/16/2024

Everyone wants to lose belly fat, right? The problem is, you can't choose where fat loss happens in your body every time you work out. Or at least, I didn’t think you could… Until I came across this new study, which suggests that targeting belly fat may be possible and much easier than we all thought. I’ll share exactly what researchers have found about belly fat loss and how you can apply it to your own training, so you burn that belly fat off.

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How To Build Muscle WITHOUT Bulking (NEW RESEARCH!)
How To Build Muscle WITHOUT Bulking (NEW RESEARCH!) episode artwork
04/08/2024

Can we build muscle without bulking? No, right? If you want to build muscle, you gotta bulk, right? I mean that’s what all the biggest guys in the gym seem to be doing. But bulking can be the WRONG way to build muscle for most people. Today I’ll share why that is and how you can build muscle without bulking up. Get ready for some of the best bulking tips you’ve ever seen.


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The ONLY 4 Ways To Build Muscle Faster
The ONLY 4 Ways To Build Muscle Faster episode artwork
03/25/2024

Building muscle takes time. But what if you could press the “fast forward button” on muscle growth? Scientifically, there are only 4 strategies you can use to build muscle fast. Most people only take advantage of 1 or 2 of them. Or, they do them all incorrectly, which stops them in their quest to gain muscle fast. In today’s podcast, I’ll reveal what the 4 strategies are and how to use them to build muscle faster properly.

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The #1 Diet To Lose Fat (FOR GOOD!)
The #1 Diet To Lose Fat (FOR GOOD!) episode artwork
03/18/2024

Why is it that only about 10% of us succeed at a fat loss diet? Well, most of what people learn about how to diet to lose fat is wrong, and just sets you up for failure. But after over 10 years of studying the science, working with top dietitians, and testing on thousands of clients, I want to share a game-changing weight loss diet that I guarantee will work for you. But pay attention, because every detail in this fat loss diet matters. Here’s the best diet for fat loss.


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The #1 Workout That Blew Up My Butt
The #1 Workout That Blew Up My Butt episode artwork
03/11/2024

Want stronger glutes? Today I’m sharing the #1 glute workout that grew my flat butt. Strong glutes can go a long way to preventing knee pain and lower back pain. But they also help complete a well-developed physique. To grow them, you only really need 3 best glute exercises. I’ll show you the full detailed glutes workout at the end, but you need to do the glute exercises properly so pay attention.


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The Smartest Way to Build Muscle (Ft. Mike Israetel, Eric Helms, Alan Aragon & Brad Schoenfeld)
The Smartest Way to Build Muscle (Ft. Mike Israetel, Eric Helms, Alan Aragon & Brad Schoenfeld) episode artwork
03/06/2024

Want to learn how to build muscle most effectively? Good news: I’m bringing you exclusive insights from 7 of the world’s smartest hypertrophy scientists. Using their research on muscle growth, I’ll create a step-by-step blueprint that will serve as your ultimate muscle-building hack. Without further ado, here’s the best way to build muscle.


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How to Get Shredded in 2024
How to Get Shredded in 2024 episode artwork
02/12/2024

If you want to actually get lean this year, the odds are stacked against you. More than 80% of people who try getting lean end up failing. But 3 simple, science-backed steps have gotten me, and several others, leaner than they’ve ever been before. We'll cover a full fat-loss meal plan, the best exercises for fat loss, how to lose stubborn belly fat, and more.


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How To Build Muscle Almost 2x Faster (NEW RESEARCH)
How To Build Muscle Almost 2x Faster (NEW RESEARCH) episode artwork
#25
02/06/2024

You might be able to gain muscle faster (almost twice as fast!) as you are right now - and still remain “natty”. How? With what I like to call “stretch-focused training”. A training technique that has seemed to crack the code to what it takes to build muscle fast naturally. I’ve even started experimenting with it, and honestly, it seems like it’s working. Don’t just take my word for it, though. I’ve assembled my elite crew of researchers to dive into the science, separate the truth from the fad, and figure out the best way to use this trai...


The #1 Workout That Blew Up My Arms
The #1 Workout That Blew Up My Arms episode artwork
02/05/2024

This is the #1 arm workout that blew up my arms. There's only 4 arm exercises, but it's the science behind them that makes them so effective. Before we dive into exercise 1, realize that I was not born with big arms. God blessed me with twigs. I spammed them with bicep curls and tricep pushdowns in every single arm workout for bigger arms, but it didn't get me very far. As soon as I trained smarter and used the correct arm exercises, my arm growth took off. I don’t want you to make the same mistakes I did, so today we...


The Worst Bench Press Mistakes Everyone Makes (Avoid These)
The Worst Bench Press Mistakes Everyone Makes (Avoid These) episode artwork
02/05/2024

Most people don't know how to bench press with the proper bench press form. For example, do you ever feel pinching or pain in your shoulder when you bench press? Or maybe it activates your shoulders and triceps more than the chest? Or maybe every time you start going heavy you end up hurting yourself. This isn’t because the bench press is a bad exercise, it’s just that most people do it wrong. There are 5 mistakes almost everyone makes with their bench press technique — be it on the barbell bench press or Smith machine bench press. Fix these b...


The #1 Workout that Blew Up My Shoulders
The #1 Workout that Blew Up My Shoulders episode artwork
01/23/2024

Wondering how to grow your shoulders? Today I want to share the #1 shoulder workout that absolutely blew up my delts. My Filipino genetics blessed me with a 1:1 shoulder-to-waist ratio and narrow clavicles that made me look frail and weak. But I refused to let my genetics define me. This past year, my shoulders are wider, broader, and fuller than they’ve ever been. I followed a simple, science-based shoulders workout that’s worked better than anything I’ve tried in the past. There are only 3 shoulder exercises (including the crowd fav, lateral raises) in this shoulders workout, but proper form is...


How To Pick The Best Protein Powder (CHOOSE WISELY!) ft. Bill Willis
How To Pick The Best Protein Powder (CHOOSE WISELY!) ft. Bill Willis episode artwork
#24
11/26/2023

Once you do decide that you’re ready to invest in a protein powder, it’s important that you first get well informed of the differences between the various protein powder types out there (e.g. whey protein isolate vs whey protein concentrate) , as well as the things to look for and things to avoid when comparing different brands. This helps you get the best protein powder available. By the end of this podcast, you’ll know exactly how to pick the right protein powder type for you, and how to separate the good from the not-so-good options out there...


How To Awaken Your Glutes (DO THESE EVERYDAY!) ft. Dr. Stuart McGill
How To Awaken Your Glutes (DO THESE EVERYDAY!) ft. Dr. Stuart McGill episode artwork
#23
11/12/2023

Your glutes are important. But the problem nowadays though is that we tend to sit a lot and for prolonged periods of time, which is a great way to potentially “forget” how to use your glutes especially if you don’t take action to counteract this.

So, if you suspect you’re suffering from ‘gluteal amnesia,’ or you’d just like to see better results with your glutes exercises and glute workouts, then it’s time to start learning how to activate your glutes. And to do so, we’re going to use a 4 step glute activation plan. Where with t...


How To PROPERLY Use Cheat Meals To Lose Fat Faster (3 Science-Based Tips)
How To PROPERLY Use Cheat Meals To Lose Fat Faster (3 Science-Based Tips) episode artwork
#22
10/27/2023

Cheat meals can help boost your fat loss results as opposed to hinder them. How? And how does The Rock incorporate his cheat meals? Well, first off and arguably most importantly is the psychological benefit having cheat meals while cutting provide. You’ll exhibit long-term adherence and enjoyment to your diet when you have these planned ‘refeed day’ to work towards in your workout meal plan and look forward to. Second, the temporary increase in calories and carbs by adding a cheat meal into your meal plan to get ripped has been shown to lead to better appetite suppression, higher...


How To Get Bigger Forearms FAST (3 Science-Based Tips)
How To Get Bigger Forearms FAST (3 Science-Based Tips) episode artwork
#21
10/13/2023

Well-developed, big forearms are one of the most important features that you’ll want to achieve. In addition to dramatically improving the appearance of your arms, they also play a vital role in strengthening your grip to handle more weight. But when most people aim to strengthen and build bigger forearms with a forearm workout, they fail to realize just how many forearm muscles there are and what their respective functions are, and think that a few sets of wrist curls and wrist extensions are all that’s needed. And although these forearm exercises can help, they don’t target...


Pre-Workout Supplements: How To PROPERLY Use It To Boost Performance (Avoid Side Effects!)
Pre-Workout Supplements: How To PROPERLY Use It To Boost Performance (Avoid Side Effects!) episode artwork
#20
09/03/2023

When it comes to which supplements to take and the best workout supplements that are backed by evidence – pre-workouts are definitely a top choice. But although pre-workout supplements are one of the most popular workout supplements within the fitness industry, most people just don’t use them in a way that maximizes their effectiveness while minimizing any potential side effects. For example: how often you take your pre-workout, how much you take, and when you take it are all important factors that will affect how well the supplement will benefit your workouts. Luckily, in this podcast, I’ll discuss exactl...


The PERFECT 10 Minute Daily Posture Routine (FIX YOUR SIT!)
The PERFECT 10 Minute Daily Posture Routine (FIX YOUR SIT!) episode artwork
#19
08/27/2023

Sitting for the majority of the day can lead to the development of the posture where the head protrudes forward, the mid back and shoulders round forward, and the lower back arches excessively with an anterior tilt of the pelvis. Which can then lead to tightness and aches and pains in the neck, shoulders, lower back, and other areas. To reverse the adverse effects of sitting too much, I’ll be showing you two quick and easy 5-minute corrective routines with 8 exercises for posture that you can do anywhere, that are designed to mobilize these tightened areas (fix rounded sh...


The BEST Science-Based Meals For Fat Loss (3 Diet Hacks You Need To Make)
The BEST Science-Based Meals For Fat Loss (3 Diet Hacks You Need To Make) episode artwork
#18
08/20/2023

Have you been dieting for years, and yet you see no visible reductions in body fat? In this podcast, I’ll be covering the top 3 essential fat-loss diet tricks you need to adopt when it comes to an optimized fat-loss diet for weight loss. I'm confident that by the end of this podcast, you'll know what to eat for fat loss, such that you’ll finally succeed in your attempts at a diet to burn fat. I’ll also cover some of the best meals for fat loss you can add to your fat-loss meal ideas bank. Who said dietin...


How Many Steps Should You Take To Lose Fat? (HIT THIS NUMBER!)
How Many Steps Should You Take To Lose Fat? (HIT THIS NUMBER!) episode artwork
#17
08/13/2023

Can you lose weight by walking? Yes–walking is hands down one of the most effective yet underrated forms of activity that you can do to burn off fat. And the beauty about walking is that it can be done anywhere. Also, drastically increasing your step count can easily be done even in the comfort of your own home by just implementing a few simple tips.

But, on that note guys, just keep in mind that for the best results, these additional steps you’ll be taking need to be paired with a solid nutrition plan and regu...


Creatine: How to Best Use It for Muscle Growth (Avoid Side Effects)!
Creatine: How to Best Use It for Muscle Growth (Avoid Side Effects)! episode artwork
#16
08/06/2023

Creatine is one of the few supplements out there that is actually well-backed by research in terms of its effectiveness. However, there’s a lot of confusion out there as to how to take creatine and how creatine works.

In terms of “what does creatine do”, it simply allows a faster regeneration of ATP in our muscles. Since ATP is the main form of energy for our muscles, this enables us to perform an extra rep or two during our training.

As for the best creatine to take and how to use creatine effectively, stick to cre...


How To Pack On 10lbs Of Muscle As A Hardgainer (STEP-BY-STEP PLAN)
How To Pack On 10lbs Of Muscle As A Hardgainer (STEP-BY-STEP PLAN) episode artwork
#15
07/30/2023

I initially thought that I was a lost cause as a skinny hard gainer when it came to how to gain muscle fast, but in reality, I was just making a few key bulking mistakes. I’m positive that this is the case for many of you as well. So to help show you, a fellow ectomorph, how to gain muscle mass, I’ll show you how to avoid these crucial mistakes by going through step by step how to set up a hard gainer workout plan, along with mass gain diet tips, to pack on 10lbs of muscle and...


Eat Twice As Much, Keep Calories The Same (Eat These Instead) Ft. Coach Kelly
Eat Twice As Much, Keep Calories The Same (Eat These Instead) Ft. Coach Kelly episode artwork
#14
07/23/2023

When people first start out with a “fat loss diet’, they are totally unaware of just how calorie-dense typical food options that they’re used to eating really are. Which is one of the biggest diet mistakes around. Plus, is one of the main reasons why many who “eat clean” or “work hard” are still not losing stubborn fat.

Hopefully, you can see just how much more food you’re able to eat and how much easier it would be to suppress hunger and adhere to your diet by simply making smarter food choices.

And for those lookin...


How to Relieve Muscle Soreness and Recover FAST (4 Science-Based Tips)
How to Relieve Muscle Soreness and Recover FAST (4 Science-Based Tips) episode artwork
#13
07/16/2023

Muscle soreness (also known as delayed onset muscle soreness or “DOMS”) is something we can all relate to. The sore legs and various other sore muscles we experience after a hard workout can be an uncomfortable feeling. Although this is perfectly normal, sore muscles becomes a problem when it interferes with your muscle recovery.

If your muscle soreness after a workout sticks around until your next workout, this is going to negatively impact your workout AND further interfere with the muscle recovery process. Thus, it’s essential that you optimize your muscle recovery after a workout in order...


The 4 BEST Supplements To Build Muscle Faster (And How Much They Help) ft. Dr. Brad Schoenfeld
The 4 BEST Supplements To Build Muscle Faster (And How Much They Help) ft. Dr. Brad Schoenfeld episode artwork
#12
07/09/2023

One of the most common questions I get is: ‘What are the best supplements to build muscle? There's a ton of misinformation out there when it comes to the best supplements for muscle building and strength. In this podcast, I'll share the 4 best supplements that are worth considering to build muscle faster.

Special guest: Dr. Brad Schoenfeld


Light Weights vs Heavy Weights for Muscle Growth
Light Weights vs Heavy Weights for Muscle Growth episode artwork
#11
07/02/2023

Conventional wisdom has us convinced that high reps and light weights build muscle endurance and contribute little to muscle mass gains. However, is this a valid perspective? We need to look at the research to determine if heavy and light weight training cause different effects. After reviewing the research out there, it seems that using heavy or light weights doesn’t matter much in terms of hypertrophy. Studies show that muscle growth tends to be equal despite using light or heavy weights (high rep vs low rep). But this is only true when going near failure, and one benefit of...