If you’ve ever peered into a Pilates studio and spotted what looks like a cross between a rowing machine, a four-poster bed, and a medieval contraption, you’ve met Pilates equipment. It tends to catch people off guard. Pilates has a reputation as a gentle, mat-based practice — and it can absolutely be that — but the apparatus is where a lot of the magic happens. The springs, straps, bars, and barrels aren’t there to make things harder for the sake of it. They’re there to supp