fitness balls make for the perfect addition to your home exercise equipment to improve your core and overall strength. Perfect for , yoga, crossfit or the hundreds of low impact exercises available. Don't sure which size for you? The exercise ball that you need depends on a few things - your height, leg length and purpose of the ball. The correct size exercise ball will allow for a 90-degree angle at your knees and your thighs to parallel the floor while sitting on top. To assemble, simply inflate ball until stiff to the touch and enjoy.Easy-to-use Foot Pump - Stability balls are being used by individuals of all ages and fitness levels - Sports Enthusiast: No matter male or female, our professional grade exercise balance ball will help them to exercise abs, back, gluts, hips, arms, and other muscles; - Students: Teachers are using stability balls as chairs to improve students focus and concentration; - Pregnant and Puerpera: Women are using fitness ball to develop good workout habits during pregnancy, will help them get shape back faster after delivery. Also good for the developing baby as well; - Senior Citizens