Every 8 minutes, for 32 minutes (for times):

30/21 Cals Row/Bike/Ski (pick one and use for all 4 sets)

16 Dumbbell Squats (50/35)

16 Stationary Reverse Lunges with DB Farmer’s Carry (50/35)

400 Meter Run…

Try to keep all rounds within 5-10 seconds of one another.  Note fastest and slowest times.