No weights, no machines

What exercises can I do at home that would work as a complete circuit for the whole body? I am looking for exercises that don't require any kind of weight or machine. Like push up, and abdominals, etc.
 
Those exercises do not require weights.

Squats and deadlifts, (1-legged to allow for the fact that there is no resistance)

Lunges, push-ups, pullups (don't need weight, just a bar or something to hang from)

Sit-ups, crunches, and a million other different variations of the sit-up and crunch, i.e. with a twist, legs up in the air, knees bent, legs straight, etc.
 
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