Time under tension (TUT) is a weightlifting technique designed to build muscle mass by increasing the time muscles spend activated during an exercise. We cover if it works and what its benefits are.

This is read by an automated voice. Please report any issues or inconsistencies here. When you walk into a gym, you’ll see lifters meticulously counting sets, tracking reps and stacking plates. But ...

Decades before sports science caught up, lifters were using 21s to build size through partial reps, stretched positions, and relentless time under tension. The method spread quickly because it was ...