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Pilates exercises are good for building body awareness, alignment and conditioning. Excellent for dancers! Machines like "Reformer" and "Cadillac" are spring based systems to add resistance.Pilates mat classes, relying more on stretches is physically more similar to a yoga class.
Differences between Pilates and Yoga classes are quite subtle. Yoga focuses on stretching but fundamentally relaxing the mind. Pilates classes work on toning and improving flexibility. Do both for your mind and body!