Improve balance, alignment and posture with the GoFit Exercise Ball. Balance ball training targets both the primary and stabilizing muscles for a full-body workout that stretches, tones and tightens. Add to your regular stretching and balancing routine to target hidden muscles. FEATURES: Stretch, tone and tighten your body Train both primary and stability muscles Durable PVC plastic construction Latex-free product Weight rated to 1000 lbs at full air capacity 55cm ball recommended for users 5' - 5'5" tall Includes 2 ball plugs