SI2255.11: SISSEL 55cm Red Exercise Ball
Ideal for total body conditioning: Meets highest safety standards; noticeably relieves spinal tension and strengthens back muscles; encourages correct sitting; a proven assistive device in PT; use to sit on at home, work or school; including workout poster; surface has a pleasant, friendly to touch structure, extremely resistant to abrasion. The Securemax System: For your safety- when punctured the ball will not burst but loose air gradually; handles stationary weights up to 500 kg, burst-proof up to 130kg.
Size: Measure the length of your arm from shoulder to hand. This measurement roughly corresponds to the required minimum diameter. Always choose the ball slightly larger in diameter