Definition
Time under tension is the duration a muscle stays under load in a working set. A set of 8 reps at a 2-second eccentric, 1-second concentric tempo takes about 24 seconds. Hypertrophy responds well to 30–70 seconds of TUT per set; under 20 seconds favors strength, over 70 favors endurance.
Real questions
Does slowing reps build more muscle?
Slowing the eccentric (lowering phase) to 2–4 seconds increases TUT and mechanical tension without sacrificing load — a reliable hypertrophy lever.
Stack with
Put it to work
Coach Foster builds your program around time under tension (tut) and the rest of the fundamentals, shaped to your body and your week.