Greatness is within at Everlast. Help improve your core strength with this 55cm stability ball. Included in the set is fitness guide with exercises that can be performed on the ball. The surface of the ball is textured for better grip. The set features a large fitness cinch bag to carry your ball, pump, exercise manual, measuring tape, and other essential items needed at the gym. The bag features thick adjustable shoulder straps, ventilation grommets, phone pocket with headphone port, and mesh water bottle pocket.