Angie
For time:
100 pull-ups
100 push-ups
100 sit-ups
100 squats

Scaling
This chipper should push your muscular stamina while being metabolically taxing. Drop the reps and modify the movements for the exercises you struggle with. Try to avoid any one exercise taking more than 8 minutes.

Intermediate Option
For time:
60 pull-ups
60 push-ups
100 sit-ups
100 squats

Beginner Option
For time:
50 ring rows
50 knee push-ups
50 sit-ups
50 squats