"Use full range of motion (ROM)." That phrase captures one of our major philosophies of resistance training so well that it bears repeating. Use a full ROM. Use a full ROM. Good. Now that's hopefully ...

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

The famously fit actor Dwayne Johnson gained more muscle for "Black Adam," his strength coach said. Techniques like pause reps, negatives, and static holds were part of his muscle-building workouts.