Every 4:00 for 3 sets
3 Front squats + 3 back squats

*0:00, 4:00, 8:00
*Perform a heavy set of 3 front squats, rack the bar then immediately perform 3 back squats.

-then-

For time:
45 Jumping air squats
into:

21-15-9 for time:
Front squat (95lbs/65lbs)
Back squat (95lbs/65lbs)
Into:

45 Jumping air squats