One thing you don't have to do is hit the lap button on each transition. You'll drive yourself batty keeping count, though honestly, sometimes counting kept my mind off of what I was doing to myself....
Lap key was only for the start so that I could get to where I needed to go to do this workout. Everything else was lined up perfectly no Lap key required. My legs were def hurting from the 3x15 yesterday. Cardio wise I felt fine.
the 2x10 the first set, probably the first 3 I did seated. Which felt stupid. I wasn’t sure if they were supposed to be seated or not. I sprinted the rest of them. That was crazy, I couldn’t muster more than 700 by that time.