New Delhi, Nov. 22 -- Trying out fresh workouts is the best way to make sure that your fitness routine stays fresh, and the muscles never get used to the same kind of stimulation. This doesn't just mean different forms of workout-like HIIT and weight training and cardio or bodyweight-but it also means trying new variations within the broad branches of workout styles.

Which brings us to the most trusted way to grow your muscles: using the time under tension (TUT) method in your workouts. Time under tension means exactly what it says: the amount of time a muscle spends under tension which could be either concentric or eccentric.

So, purposely slow reps, or the slowing down of either phase of a muscle-building exercise qualifies as a TUT m...