Strengthens muscles, improves posture, balance, and core stability, helps prevent back and spine pain. 75 cm diameter (30 Inch) is designed for individuals from 6'2 Inch - 6'8 Inch (188 - 203.2 cm) tall. This blue ball is suitable for men or women. Stretch the limits of your physical fitness by integrating stability exercise into your workout or rehab routine and develop core muscles. Easy to clean, comes deflated with two plugs, one inflation adaptor, and a 24 exercise guide poster. Power Pump for easy inflating sold separately. Can be used with resistance bands or as a substitute for exercise bands for at-home workouts.