The Sunny Health and Fitness Premium Yoga Ball Extra Small 45CM - Sf-EB02-xs is designed for individuals under 5' tall and works best with desk heights of 20–24 inches. It s the perfect tool for enhancing core engagement, posture, and balance while supporting low-impact workouts 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, reliable performance. This versatile ball is ideal for yoga, Pilates, physical therapy, prenatal exercises, and more. It s also great for balance training, stretching, strength workouts, cardio, or as an active sitting desk chair to promote better posture and core activation.Widely used by physical therapists and trainers, it s suitable for rehabilitation, prenatal fitness, and advanced training routines. Inflation is easy with the included hand pump and accessories, and the ball comes with detailed instructions for hassle-free setup