This is a super quick, super intense workout. Try it for ten minutes at a time, two or three times during the day.
The workout is a countdown, with reps decreasing by half for the next exercise. You simply do the circuit as many times as you can in ten minutes.
40 jumping jacks, 20 pelvic tilt crunches, 10 squats, 5 pushups
Make sure to write down how many circuits you completed in each ten-minute segment. Next time you do the workout, you have a goal to beat!