Long Interval Workout

Choose ONE of the following sports

Swim Repeat 7:00 on, 4:00 off until form/pace deteriorates
Bike Repeat 7:00 on, 4:00 off until form/pace deteriorates
Run Repeat 7:00 on, 4:00 off until form/pace deteriorates
Row Repeat 7:00 on, 4:00 off until form/pace deteriorates