Don't even say it.
Yeah, this one's tough. Do it anyway.
The structure is simple. Go straight through the exercises. Don't move to the next one until you've finished the reps for the one before.
There's a catch.
There's always a catch.
Any time you stop, even for a brief pause, you have to add 10 reps to that exercise. So if you stop during situps, add 10 reps (for a total of 160), and if you stop again, add 10 more (170 and so on).
Take your time. This one's a marathon.
100 Pushups (knees or toes)
(Intermediate - start with half the number of reps)