Yoofit Sports Stability Ball with Pump - 65cm Balance Ball for Core Fitness Strength workout, Yoga, Pilates and CrossFit Training Exercise. Premium Anti-Burst Materials. IDEAL FOR CORE STRENGTH TRAINING WORKOUT  Yoofit stability balls are the perfect addition to your home exercise equipment to improve your core and overall strength. Great for any Pilates, yoga, crossfit or hundreds of other low impact exercises. ANTI-BURST TESTED  Professionally tested and anti-burst certified, Yoofit stability balls are well constructed with heavy duty professional grade materials making it highly durable and built to last. All testing including anti-burst are certified by SGS. VERSATILE  The advantage of using the Yoofit stability ball is that it provides safe stability during workouts of all fitness levels, from beginner to advanced, from starter to pro. Enhance functional movement, increase flexibility, build strength, & improve coordination.