Found the vid.
Keyword =
MUST
reach failure
Heavy = 3-6 reps
Light = 15-30
Results : Not very much statistically different between both sides for the 2 fellas
This is for growth only.
For me, i have just started for past few weeks with resistance bands and the exercises to do 1 warm up and 1 working set, so far is got improvement in reps. Still playing around and so far so good, can better fit the schedule and still feel good etc.
I was also watching this just mins ago.
Here’s a summary of Jeremy Ethier’s video “I Trained One Side HEAVY vs LIGHT For 60 Days (Bad Idea)” + the main take-home points:
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What He Did
He trained one side of his body using heavy weights (low reps) vs. the other side using lighter weights (higher reps) over a 60-day period.
The idea was to compare strength, muscle growth, and overall difference between the two styles when volume (total sets) is kept constant.
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What He Found
There was a difference, but it was not huge — heavy side had a small advantage in strength gains; light side still got growth.
The growth (muscle hypertrophy) was fairly similar between both sides, as long as total work/volume was matched.
Light-high rep training side had more fatigue, soreness, possibly more metabolic stress. Heavy-low rep side was more demanding on nervous system and joints.
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Final Key Points / Takeaways
1. You can build muscle with both light & heavy loads, as long as volume is adequate. The difference isn’t huge in hypertrophy if you keep total work similar.
2. Heavy weights (low reps) are better when it comes to strength gains, neural adaptation.
3. Light weights (higher reps) produce more metabolic stress, possibly more fatigue and soreness—but still valid for muscle growth.
4. Doing one style exclusively has trade-offs; mixing both heavy and light might give more balanced results.
5. “Bad Idea” in the title refers to the risk of imbalance, injury, or overemphasis on one style. It’s probably not optimal long-term to train one side heavy and the other light—better to use a variety.