Rachel Hosie at Studio Fix to try a Megaformer workout.Rachel Hosie/Business InsiderThe Megaformer, beloved by endless celebrities, is like a souped-up Pilates reformer.It provides high-intensity, low-impact workouts using spring-based resistance.I tried a Megaformer workout class and was really tough, even as a fitness reporter.To me, the word "Megaformer" conjures up images of a monster robot toy made for children, advertised in a booming man's voice.But this isn't child's play.A Megaformer is a fitness machine akin to a Pilates reformer, but souped up.