[Recommended Pilates balls for Pilates, yoga, and postpartum recovery] The Pilates ball is a set of small (15 cm) and medium (20 cm) balls that increase core strength, balance, range of motion, and posture adjustment. It can be used to balance exercises and to load muscles. Different sizes offer different levels of support and load, making them ideal for a variety of exercises that target the pelvic floor muscles, abs, oblique muscles, hips, back, arms, and legs. It is especially recommended for Pilates, yoga, ballet and postpartum training exercises. It can be easily inflated or retracted as needed. It can also be folded flat and carried.