Gym Ball
Gym balls in five sizes, 45 cm to 85 cm, one colour per size, each rated to 150 kg. Choose the size above.
Size goes by your height, not by preference. Sitting on the ball with your feet flat on the floor, your hips and knees should both land at about a right angle — too small and you fold up, too big and you slide off the front. The height guide below is the one to buy from
45cm Pink, 55cm Green, 65cm Blue, 75cm Purple, 85cm Black