If you were to survey the best bodies walking the runway (or the streets of New York City, for that matter), you’d be surprised by how many of the industry’s top models attribute their covetable frames to the same small handful of supertrainers. Among the select few who are entrusted with tightening and toning their silhouettes, New York City’s Michael Olajide, Jr. stands out from the pack. The former middleweight champion boxer keeps Victoria’s Secret stalwarts from Adriana Lima to Constance Jablonski, as well as newcomers like Romee Strijd and Kelly Gale, in peak form with professional athlete–grade routines of combination punches, bodyweight-resistance moves, and strength-training exercises. Here, we spend a day with Olajide at his Chelsea boutique gym, Aerospace, to find out exactly why he’s the go-to man for his major model clientele.