You're on the ice from 45 to 90 seconds, working your butt off, and then you come off for a rest.

176

Your body can use only so much protein, and then some of it is just converted into fat instead of going to your muscles.

141

Less rest time can sometimes increase the amount of testosterone your body is producing.

128

Feeling good about the way you look at the gym gives you an incentive to go.

90