Find a playground, any will do. 

All you need is 3 little moves. 

Cycle through til 300 reps and

Quite a workout you will get…

This is what I played with around today. Simple but effective. I used push-ups, step-ups and body rows with rounds of 30, 24, 20, 16 and 10 reps for a total of 300 reps (100 each move). I added 300 seconds of misc hanging at the end for a nice finishing touch. You could use any number of exercises or rep schemes but this seemed just right.