Rylee, who says she was already very active when she started 75 Hard, counts active rest such as yoga as one of her two workouts. Boules is a fan of that strategy, and recommends considering stretching , yoga, and walking forms of exercise (if you're hellbent on trying 75 Hard). She says that using that approach, exercising twice a day a day may be do-able for many people — but she adds that pushing too hard from the get go can be dangerous. “You might even get injured,” she says. Plus, research shows that rest days are essential for recovery. The American Council on Exercise recommends them. Plus, this is a fairly punishing way to think about exercise, and it might be enough to turn someone off from working out long term. At the end of the day, exercise should be something you do because you enjoy it, because it releases endorphins, and makes you feel good.