How Much Muscle Did I Gain In 365 Days? (Scientific Experiment)

Jeff Nippard

1.2M subscribers

1,517,646 views

Get my new Bodybuilding Transformation System (25% off for launch week) https://jeffnippard.com/ Download MacroFactor 2 weeks free: https://bit.ly/jeffmacrofactor ------------------------------- References: Proximity to Failure https://pubmed.ncbi.nlm.nih.gov/38970765/ Sleep and Mortality https://academic.oup.com/sleep/article/47/1/zsad253/7280269 ------------------------------- Written & Directed by Jeff Nippard & Stephanie Buttermore Filmed by Matt Dziadecki, Dal Shoots, Jeff Nippard & Cam Cline Edited by Rickie Ho, Sam Ding & Jeff Nippard Graphics by Rickie Ho, Sam Ding & Jeff Nippard Music Arranged by Jeff Nippard & Sam Ding Music sourced from Epidemic Sound Research Assistance by Max Edsey Experiment Design by Jeff Nippard, Alysha D'Souza, Derrick Van Every and Stu Phillips ------------------------------- About me: I'm a Canadian natural pro bodybuilder and internationally-qualified powerlifter with a BSc in biochemistry/chemistry and a passion for science. I've been training for 15 years drug-free. I'm 5'5 and fluctuate between 160 lbs (lean) and 180 lbs (bulked). ------------------------------- Disclaimers: Jeff Nippard is not a doctor or a medical professional. Always consult a physician before starting any exercise program. Use of this information is strictly at your own risk. Jeff Nippard will not assume any liability for direct or indirect losses or damages that may result from the use of information contained in this video including but not limited to economic loss, injury, illness or death.

4,521 Comments

@JeffNippard

5/4/2025

Ahhhhhhhhh my 1 year experiment results are finally here! Hope you guys enjoy the video — I had a blast making it. If you’re looking to transform your physique this year, the upper/lower/push/pull/legs program I ran for this experiment is also out now! 25% off for launch week: <a href="http://jeffnippard.com/">http://jeffnippard.com</a> Let’s get after it!!

4,263

@ryan.miller

5/6/2025

This is a great video Jeff

@adririvera

5/6/2025

this is so so impressive jeff!!!!!!!

@DylanUPSB

5/6/2025

The recomp stats you give are sneaky though! He's down in body fat percentage but up total body fat right? Because the fraction of new weight is mostly muscle. Most people think of a recomp as losing fat and gaining muscle though.

@JasonPortaPotty

5/6/2025

Really happy for Brad. Takes a lot of courage to put yourself and your fitness journey on display for millions of viewers when you're a beginner who's self conscious about your body. Really awesome stuff

@aspratt267

5/6/2025

Amazing video. Thanks for sharing your journey.

@sheikhlelouch2726

5/6/2025

FINALLY

@bloop6111

5/6/2025

Stoked for part 2. Huge respect to you both for this!!

@elio.boutros

5/6/2025

This is a life changing video !!! Seeing it reminded me why i started my fitness journey !!! Jeff thank you so much for everything and for ur support

@tylerackermann293

5/6/2025

Bro anyone else watch a Jeff Nippard video and then try to read something and hear it in his voice. I just watched this and tried to do some homework and Jeff was in my head wit that Canadian accent teaching me bout Rhetorical Analysis lol. Also amazing video just incredible stuff as always Jeff!

@Gioliftss

5/6/2025

<a href="https://www.youtube.com/watch?v=PiYSbR2B85w&t=1242">20:42</a> 💀

@youssefawadalla119

5/6/2025

Make a video about the forearms in the tier list

@jhudson_tiedye

5/6/2025

Great work Jeff and Bradley

@eli3804

5/6/2025

Wow insanely elite study and dedication!

@omarelwan3122

5/6/2025

A 1.500.000 views in one day You deserve it, man🎉❤

@stfon5

5/6/2025

Jeff now try the Adam Rochester experiment. 4-8 reps, 1-2 sets, 2-5 mins rest, 2x a week. Upper lower rest upper lower rest rest.

@SoStickyy

5/6/2025

absolutely amazing video jeff. So much effort for 1 video. Props to your brother too! Awesome video I think this has to be one of the best fitness related videos ever