Crafted from professional grade materials, the Bintiva pilates ball is recommended by health and fitness professionals for core and body strengthening. It is easy to set up and includes a straw for inflationof the ball in minutes. The ball can be inflated to between 7 - 9 inches, depending on the user's preference in terms of size and stability. The textured exterior is soft and easy to grip for maximum ease of use. The mini ball is also used in yoga poses for extra focus. Implementing the mini ball into your regular pilates routine can help challenge your balance, increase your range of motion or isolate muscles for targeted training. Though the ball is only 7 to 9 inches (20cm) in diameter, this small tool can make a significant difference when it comes to toning core muscles. While using this ball, focus on your posture and on activation of core muscles. Be sure to maintain an even breathing pattern as you contract and release your muscles throughout the workout.