A good pilates instructor should know how to work with a wide range of bodies, big and small, short and tall, injured and pain-free. — When I first tried pilates, I didn’t expect to feel like I was going to suffocate. I was lying on my back on an athletic mat, surrounded by other students on their own mats, listening to the teacher’s cues. “Put your legs in tabletop,” she said. I made a “tabletop”…