For 20 minutes perform:
Strict pull-ups - push-ups - squats
If you can finish 5 rounds by 5:00, switch to:
If you can finish 3 rounds by 10:00, switch to:
If you can finish 2 rounds by 15:00, switch to:
40-80-120 reps, then stop.
If you are unable to meet a time hack then continue with your current rep scheme until 20 minutes is up.
Post total reps of WOD to the Zen