Take crunches, bridges, push-ups, squats and planks to the next level by continually engaging your core and back muscles for improved strength and balance. Perfect for rehabbing, warming up and stretching or as a support tool to break plateaus in resistance and HIIT workouts, the Lifeline Burst Resistant Exercise Ball helps train and build the stabilizer muscles needed for functional strength and athletic performance. DESIGN & BENEFITS: Excellent for fitness, core stability, yoga, Pilates and balance training Exercise guide graphics printed on ball Made of proprietary burst resistant material that is designed to deflate slowly for safety if punctured; latex-free Includes fast inflation pump and plugs 55cm: 5'1" - 5'7" user height / 65cm: 5'8" - 6'1" user height / 75cm: 6'2"+ user height WARRANTY: Lifeline Fitness warrants that the products sold to be free of defects in materials and workmanship and to be in perfect working order at the time of purchase. If the product should, for any reason, become defective within 60 days of purchase, Lifeline will replace the product once it is returned to Lifeline. This warranty does not apply to any damage caused by accident, abuse or misuse of the product. There are no other warranties other than those expressly set forth within.