“There is a simple tool in your gym that can turn up the toning of just about any body-weight move you do. And if you haven’t gotten the grip of a TRX Suspension Trainer yet, here’s your hookup. ‘You’ll recruit more muscle fibers with each rep because you’re working on an unstable surface,’ says Marianna Biribin, a trainer for Exceed Physical Culture studio in New York City, who designed--and demos--the total-body routine on the next page using the tricked-out straps. (No gym? Try the at-home version of TRX, $200, trxtraining.com). Do two sets, and bump it up an extra 10 reps or a set once you’ve learned the ropes.” TRX Featured in Fitness Magazine February, 2014.