The Sunny Health & Fitness Premium Yoga Ball Small 55CM - SF-EB02-S is designed for individuals 5'1"–5'8" tall and works best with desk heights of 28–30 inches. This versatile ball enhances core strength, posture, and balance while supporting low-impact exercises for all fitness levels. Made from durable PVC, it features anti-burst technology, a non-slip surface, and a 660 LB weight capacity for safe and reliable performance. Perfect for yoga, Pilates, physical therapy, prenatal exercises, and more, it’s also ideal for balance training, stretching, strength workouts, cardio, or as an active sitting desk chair to promote better posture and core engagement. Trusted by physical therapists and trainers, it’s a great tool for improving stability, flexibility, and endurance. Easy to inflate with the included pump and accessories, the ball comes with clear instructions for hassle-free setup.