Description Tendu Stability Ball This anti-burst Yoga Fitness ball is ideal for core strength training. Widely used in PBT (Progressing Ballet Technique) Yoga, Pilates and other fitness classes. Currently available in 3 sizes- 55cm, 65cm and 75cm **Please note the different colours as per size To select your size: When you stand next to an exercise ball, it should be even or slightly above your knee level. The best way to size up your ball is by sitting on it. When you sit on the ball, your knees should be bent at a 90-degree angle and your thighs should be parallel or even with the floor. Find your height and see which ball size you should try first. 4’8” to 5’3” – 55 cm ball 5’4” to 5’10” – 65 cm ball 5’10 to 6’4 – 75cm ball We also have a personalised PBT kit bag containing all the items you need: https://premierdancewear.co.uk/product/pbt-kit-in-personalised-bag-copy/