Seven and seven and seven... Workout

AMRAP in 7:00 of 7-pull-ups, 7-box jumps (24/20). Rest 1:00
AMRAP in 7:00 of 7-push-ups, 7-air squats, Rest 1:00
AMRAP in 7:00 of 7-burpees, 7-atomic sit-ups (V-ups).

Rounds: 20