Although no one actually pronounces the equals sign, it's appropriate that IM=X (Integrated Movement eXercise) resembles a scientific equation: it applies modern research in cardiovascular health and spinal anatomy to the time-tested discipline of Pilates. Since it was founded in the late 1990s, this fitness method has drawn the attention of media outlets such as Shape, Self, and the New York Times.

The program’s concept stemmed from founder Elyse McNergney’s Pilates certifications, master's in movement science from New York University, and master's of education in exercise physiology from Columbia University. McNergney devised a method for teaching students how to stabilize their core-muscle groups while keeping the spine elongated and safe during the workout. Its ideal outcome is a decompressed spine, better posture, and the ability to provide piggyback rides for 12 toddlers at a time. The program has also been used to rehabilitate professional athletes, dancers, and patients suffering from chronic pain.