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Why this: High-intensity interval training (HIIT) should be familiar to most gym-goers—and followers of fitness trainers on Instagram—as an effective way to torch fat. Now one more reason to start doing HIIT: The workout may help to reverse signs of aging. In a new study published inCell Metabolism, researchers found that the group participating in high-intensity exercises, such as cycling and fast-walking intervals, yielded the most benefits at the cellular level, with a reversal in age-related cell processes. The classic HIIT move that Rosante recommends adding to your fitness routine: the burpee.

How to do it: Stand with your feet hip-width apart. Lower down into a squat, place your hands on the floor in front of your feet, then kick your legs pack into a plank position. Do one push-up (lower to your knees if you need to). Hop your feet forward to their original position, stand and jump into the air. That's 1 rep. Do as many as you can for 30 seconds, then rest for 30 seconds. Repeat 4 times.

Did you know: According to one small study, performing 10 fast-paced burpees was found to be just as effective at revving up the metabolism as a 30-second all-out sprint.
As a reminder, always consult your doctor for medical advice and treatment before starting any program.