12/11/2025
🧐Today I’m digging into a brand new 2025 study published by friends & colleagues , , and adamjonescpt which looked at a hot topic in hypertrophy research👇🏽
🧐Is training harder in the stretched position actually better for muscle growth & strength than making the rep more challenging in the shortened or “squeeze” position?
( 🎥 Full Video breakdown in YT channel )
👉🏼You’ve probably heard claims from various phd influencers like “lengthened training is superior” or “stretch bias equals more growth.”
📊A lot of earlier research seemed to support this notion — but those studies also manipulated more than one variable such as the exercise selection, ROM, joint angles, and resistance curves, making it hard to know what actually caused the difference in muscle growth.
🔬This new study controlled all of that. Participants trained both limbs with the same exercises, same ROM, same volume, same effort, and same tempo.
The only difference? One side had peak torque in the lengthened position, and the other side had peak torque in the shortened position.
Participants trained 4 exercises — reverse flyes, chest flyes, lateral raises, and hip extensions — twice per week for 10 weeks, taking every set to failure. Muscle growth was measured using MRI, which is the gold standard for assessing hypertrophy.
📈 So what did they find?
Both conditions grew equally across every muscle group! And the strength gains? Also identical. There was no advantage to biasing peak torque toward the stretched or shortened positions — at least in this group of untrained lifters when everything else was matched.
🔑 So what does this mean for you?
When the exercise, ROM, effort, and volume are held constant, simply shifting where the peak tension occurs doesn’t seem to change hypertrophy much.
So this leaves the question - What does matter?
Training hard, using enough volume, and moving through a full range of motion. And for most people, choosing exercises that feel stable and comfortable is likely far more important than chasing a specific torque curve.