How to do it
Do this to finish your workout. Get into position with your hands gripping a pair of kettlebells and your feet on a box at roughly the same height as your hands. Brace your abs and glutes, and keep your body straight. You’re aiming for a total of five minutes, but you can break it up how you like – 30 seconds on, 30 seconds’ rest is our suggestion. Think you can do 2 ½ minutes in one go? It’s your funeral.