Rowing and running!

Metcon

Every 10 minutes, for 40 minutes (4 sets) for times:

40/30 Calories of Rowing 

800 Meter Run

50 Double-Unders

Modify the workout appropriately such that you get between 2-3 minutes of rest between sets. The intent is smooth pacing and four sets that are very similar in time. If you are running over the 8-minute mark, scale back accordingly.