At the Core of the Pilates method: the Powerhouse
Pilates is the penultimate embodiment of core strength training. Your core, or commonly called, the powerhouse, is comprised of the upper and lower abdominal muscles, the lower back and the buttocks.
Conventional forms of exercise and athletic activities develop strength in your arms and legs, but largely ignore this area because these muscles are difficult to isolate and strengthen.
This is the same set of muscles that support good posture and, if not used properly, will deteriorate with time.