Every 3:00 for 9 sets
Set 1: 5 back squatsSet 2: 3 back squatsSet 3: 2 back squats
Set 4: 5 back squatsSet 5: 3 back squatsSet 6: 2 back squats
Set 7: 5 back squatsSet 8: 3 back squatsSet 9: 2 back squats