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"""Effective Whole Body Workouts: Combines elements of cardio, strength and flexibility in unique and highly effective workouts; Forces you to maintain your center of gravity while performing each exercise.""" Strengthen and Grow Muscles: Carefully crafted 66 cm ball increases the difficulty of workouts and builds strength faster by forcing the involvement of more muscles during each exercise repetition. """Versatile Fitness Equipment: Improves flexibility, endurance, strength and power by performing versatile workouts. Designed with extra texture to keep your hands and feet from slipping.""" Made for stability: Ideal device for rehabilitation and physiotherapy with the unstable surface that promotes core stability and general muscle strengthening exercises. """Full set: Includes a guided workout and easy to use pump; Made of strong, non-slip, non-marking durable latex material and can hold up to 159kg."""