Working your muscles through a fuller range of motion during weight training might make them grow a little bigger than training with a shorter range, but it’s not always clear or the same for every muscle.

Some people get much bigger and stronger from weight training than others—even when they do the exact same workouts—because everyone’s body responds differently to exercise.

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.

Lifting heavy weights (80% of your max) makes your thigh and arm muscles grow much bigger than lifting light weights (20% of your max) when you do the same total workout over 12 weeks.

Your muscles don’t get bigger or smaller right after a single workout, no matter how hard or how many reps you do.

If you're a young man who already trains regularly, doing more sets with lighter weights for 6 weeks can make your thigh muscle grow a little bigger — but doing fewer sets with heavier weights won't make it grow at all.