MAXIMIZE YOUR CORE STRENGTH! Training with IRON GYM® Exercise Ball improves flexibility, posture, coordination and balance. Enhance spinal stability and muscle tone in all of the major muscle groups. IRON GYM® Exercise Ball is Ideal for total body toning and stretching. Perfect for all fitness levels! Benefits • Perfect for abs, back & obliques • Improve balance & endurance • Ideal for stretching Features • Burst resistant construction • Diametre 55 cm - ideal for Users: 146 - 165 cm • Pump included