Endurance - Running Annie Workout

For time:
50 Double-Unders, 50 Abmat Sit-Ups, 600 Meter Run
40 Double-Unders, 40 Abmat Sit-Ups, 600 Meter Run
30 Double-Unders, 30 Abmat Sit-Ups, 600 Meter Run
20 Double-Unders, 20 Abmat Sit-Ups, 600 Meter Run
10 Double-Unders, 10 Abmat Sit-Ups, 600 Meter Run

1 min rest between rounds.