Part 1: warmup
Workout will take a while. Get warmed up quickly and get after it.
40 double unders
Option 1: as written above
Option 2: 15 ring rows instead of pullups; 2x single unders
Option 1+: heavy wallball; chest to bar pullups
If all rowers are occupied you may start your next set of wallballs and take a rower when one is available.
Modify by reducing to 3 or 4 rounds.