These are workouts that can be executed without any equipment, in any place you feel comfortable. Here you can find a big collection of many workouts that you can perform at home and keep you fit.
For time:
Squat 5 intervals of 20 seconds on 10 off,
Run 400 meters,
Squat 4 intervals of 20 seconds on 10 off,
Run 400 meters,
Squat 3 intervals of 20 seconds on 10 off,
Run 400 meters,
Squat 2 intervals of 20 seconds on 10 off,
Run 400 meters,
Squat 1 interval of 20 seconds.