RE Balance Ball, 55cm, Suitable for Heights 150-170cm, 300kg Capacity (Includes Fixed Ring and Pump), Core Exercise, Chair Alternative, 1-Year Warrant

[Sitting is Exercise] The balance ball's springiness and inherent instability of its spherical shape strengthen your core. Using it instead of a chair quickly transforms it into a comfortable workout. [Safe with Attachment Ring] Renaissance's balance ball comes with a attachment ring, making it easy to sit on while maintaining balance. It's safe for those unaccustomed to sitting on an unstable ball, as well as for elderly people whose balance deteriorates due to weakened core muscles and leg strength. Burst-resistant type [Hand Pump Included] The included hand pump allows you to inflate and use it right away. * Due to the self-durable material, if it does not inflate to the recommended size in one go, please allow time for inflation and patiently inflate it several times. [Thick, Durable Material] It provides excellent stability when sitting. Its moderate springiness and rebound make it ideal for training, allowing you to smoothly and comfortably sway your pelvis back and forth, side to side, and rotate while sitting on the ball!