Range of Motion

When you do a curl, ROM is the distance between the fully extended arm and the point of maximum elbow flexion. When you squat, it's the distance between the standing position and the lowest point you can reach with good technique. Every exercise has its own optimal ROM, and it isn't always the maximum possible: it depends on your structure, your mobility, and the goal you're chasing.

Research is clear on one point: training with full ROM produces more hypertrophy than partial ROM at the same load. The reason is simple. A wider arc of motion places the muscle under tension for a longer stretch, recruits more fibers, and generates more mechanical damage, especially in the lengthened portion. This doesn't mean partial ROM is useless. There are specific situations where shortening the movement makes sense: to work on a sticking point, to add volume without excessive joint stress, or to manage an injury.

The practical rule is this: if you don't have a specific reason to reduce ROM, work through the full arc. Control the weight in every centimeter of the movement, without bouncing and without cutting. When ROM shortens involuntarily, it's a signal that the load is too high or that fatigue has compromised your technique. Track your progress and make sure ROM stays consistent set after set: it's one of the most underrated parameters for measuring training quality.