Is it possible to modify the calendar of the workout I have chosen?
Inferno is a 21-day challenge so it is on a set calendar. Some of the other programs are progressions and not calendar based (Yoga and MOVE! for example).
I'd suggest that if you are going to do the Inferno workouts and only want to do them a few times, you can just use the "Discover" feature to pick the best workout when you are ready to workout.
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