CORTEX Gym Ball 75cm XT Series Our exponential air resistance system

Our exponential air resistance system lets you find the perfect challenge for your ability level

and the mesh back pocket conveniently stores phones and keys

87cm grip diameter and 2x Needle Bearings per sleeve (total of 4) for great spin and easier to stabilise during lifts

The plyometric tool that grows with you

Designed for Gym or Commercial use

CORTEX Gym Ball 75cm XT Series Our exponential air resistance systemOur Cortex 75cm fitness balls are extremely versatile and inexpensive exercise tools that can be used to work out nearly every muscle group in the body. They can be used to improve your posture, core strength and overall balance and stability. Lifespan Fitness balls are made of quality anti burst, UV resistant material and are guaranteed to last.