Have 4 Minutes? Then You Can Do This 30-Day HIIT Challenge

The holidays usually mean two things: eating more and exercising less. But don't worry, we're not going to tell you to give up sugar and start training for a marathon (unless that's your thang, of course). Instead, commit to short bursts of exercise each day to (a) blast calories and (b) stay motivated. "This challenge is designed to work your entire body over the course of a week, while making it easy to fit exercise into your schedule," says Amanda Butler, trainer at The Fhitting Room in New York City (a studio dedicated to HIIT), who created the plan. "We're not asking for more than four minutes a day, but once you get started, it'll be hard to stop." Trust.

30-Day HIIT Challenge How-To

Your plan: Start each day with a 30-second cardio warm-up. Think: Jumping jacks, high knees, butt kicks, and jumping rope. Then, do each daily exercise for just one minute. Every fifth day, you'll put the moves together for a full-body blast. If you have more time, keep rotating cardio intervals with the exercise of the day, and follow along with one of these fat-blasting workouts.