Bodyweight intervals using functional movements over a period of 20 minutes.
Pull-Ups: Chin must go over bar. If fatigued, do negative reps.
Push-Ups: Arms must reach 90 degrees or below parallel. If fatigued, push-up on knees or elevate placement of hands.
Squats: Must make 90 degrees or below parallel. If fatigued, sit on and stand up from an object (chair, bench, etc.)