This quality 8" high balance trainer adds a new dimension to exercises like sit-ups, push-ups, jump squats, ball lunges, yoga poses, Pilates and core workouts as your body adjusts to the instability and wobble created; improve your posture, tone muscles, and accelerate your cardio gains. Our exercise ball provides an innovative built-in inflator, allowing you to pump up this workout equipment in less than 3 minutes without tedious manual work; everything is easily powered from any available USB port using the provided cable. To keep you in total control, the half-ball surface is traction-textured so you can wobble without worry; the 23-inch flat base firmly grips the ground thanks to its 8 nonskid rubber feet.