“Sprinting is an anaerobic exercise, which means you produce energy without burning oxygen,” explains Mark Jarvis, strength and conditioning coach for the English Institute of Sport, which oversees the training of Olympians. “The recovery time happens after your workout, so you can exercise for a short amount of time yet still be burning calories for the rest of the day.” Perfect for busy professionals who are time short but want to burn fat — Jarvis recommends running at your maximum speed for 10 seconds followed by a further 20 seconds and repeating the exercise for eight sets. A grand total of just four minutes. As sprinting builds strong quadriceps and glute muscles, you’ll also tone your legs and lift your bottom at the same time.