Equipment: None
Time: 18 MINUTES
TARGET:Total body
KILOJOULES BURNED: *
1 037kJ (As measured by a fit 1.8m, 80kg man using a Polar FT7 watch)
Best for: Fitting in a quick, metabolism-revving workout when you’re on the road, pressed for time, or don’t have access to fitness equipment or a gym.

How to Do it
Perform 50 reps of each exercise in any order as quickly as you can without rest. You don’t have to do all 50 reps in a row – you might do 20 push-ups, move on to jumping jacks, do another 15 push-ups, and so on. Once you complete the circuit, rest one to two minutes and repeat. Do up to three circuits total, starting with a different move each time.