On the minute, every minute, for 15 minutes (5 sets), complete:
Interval 1 – Chin-to-Bar Pull-Ups x 20 seconds Max Reps
Interval 2 – Wall Ball Shots x 20 seconds Max Reps (20 lbs to 9′ target; 10 lbs to 9′ target)
Interval 3 – Double-Unders x 20 seconds Max Reps

Notes:
Try to maintain consistency with each interval. Be smooth and efficient at each station, maximizing the 40 seconds of rest. Work on your breathing rhythm during each movement and strive for quality of movement throughout the 15 minutes.