Whether you do strength exercises with your muscles stretched out or more shortened, your muscles grow about the same amount in different parts — no big difference.

Doing strength exercises with your muscles stretched more or less doesn’t seem to make much difference in how much each part of the muscle grows — all parts grow about the same.

Even though muscles might grow a tiny bit more at the far end when stretched more, it’s so small that it doesn’t really matter in practice — all parts grow about the same.

If you do a workout that targets both your upper and lower body, your muscles in those areas won't grow at the same rate or in the same way. Research shows that most combined workout routines lead to noticeably different muscle growth patterns between your arms and chest compared to your legs and glutes.

Even the middle parts of your muscles grow more when you stretch them fully during workouts — it’s not just the ends that benefit from full range of motion.

If healthy guys between 18 and 40 lift weights regularly for at least two weeks up to a year, they typically gain about 1.5 kilograms of muscle—no matter what kind of weight routine they follow.