I love my long training runs, but most days carving out more than an hour to work out just isn't in the cards. And when my schedule is really crammed, shoehorning a sweat session seems next to impossible.
Luckily, the fantastic fitness team at SELF let me in on a little secret: You can get an hour's worth of fitness and calorie burning in 20 short minutes. Yes, I was skeptical at first, but this fat-blasting routine is as ultraeffective as it is speedy, and the secret lies in high-intensity spurts of energy. Here's how to do it: