Work for 20 seconds, then rest for 10. Go straight down the list of exercises, counting total reps. At the end, rest 1 minute and repeat. 4 times for beginners, 5 for intermediate, 6 times through for advanced.
2. Squat Jumps (Squats for Beg/Int)
3. V-Ups (Situps for Beg/Int)
5. Mountain Climbers
6. Burpees (Plank for Beg/Int)