Pilates is a safe and great way to get your body moving if you have not been participating in regular exercise without putting undue stress through your body. However, some studies have shown that neither Yoga or Pilates significantly changes your body composition. The best results for this is other methods of training such as Cardio workouts. However, Pilates does such a good job at strengthening your stability system it signficiantly reduces the risk of injury that impact or weighted exercises can create. Importantly you must be eating a balanced and nutritious diet to get the best results.