WOD - On the Minute

3 separate 'on the minute' sets for the exercises below.  Each set consists of doing 1 rep the first min, 2 reps the second, 3 the 3rd and so on.  Keep going until you cannot finish every rep for a given minute.  Feel free to scale back the difficulty of an exercise as time goes on

• chair-assisted pull ups
• russian twists x2 (so back and forth twice is one rep)
• push ups