Short interval Workout

Choose ONE of the following sports:
Swim (THU): Repeat :30 on, :30 off until form/pace deteriorates
Bike (THU): Repeat :30 on, :30 off until form/pace deteriorates
Run (THU): Repeat :30 on, :30 off until form/pace deteriorates
Row (THU): Repeat :30 on, :30 off until form/pace deteriorates

Post sport, times, and total number of intervals to comments.