Don't get your bodysuit in a twist—we're not bringing '90s-style step aerobics back. (As if!) But the step itself? "It's one of the most versatile and underutilized pieces of equipment," says Amber Edwards, a group fitness instructor at Equinox in New York City, who created this routine (and not a cheesy grapevine involved). Just as the platform revolutionized cardio back in the day, this newer take gives a fat-blasting boost to your strength- and interval-training workouts. Starting with the first move, complete as many reps as you can in 60 seconds. Proceed immediately to the next exercise without resting, and repeat. Continue until you've finished all four moves, then rest for one minute. Do three circuits two or three days a week.
