Every 3:00 for 9 sets

Set 1: 5 back squats
Set 2: 3 back squats
Set 3: 2 back squats

Set 4: 5 back squats
Set 5: 3 back squats
Set 6: 2 back squats

Set 7: 5 back squats
Set 8: 3 back squats
Set 9: 2 back squats