Measure your height. Your knees should be at a right angle when you are sitting on the ball with your feet facing forward. Stand against a wall with no shoes on and your feet flat against the floor and wall. Use a pencil to mark the spot that the top of your head reaches. Use a tape measure to get an accurate measurement of your height.
Choose a ball that fits your height. Use your measurement to get the yoga ball in an appropriate size. If you are 5 feet (1.5 m) or shorter (152.4 cm), you will want a ball that is 18 inches (45 cm). If you are 5 feet (1.5 m) 1 inch (155 cm) to 5 feet (1.5 m) 7 inches (170 cm), try a 22 inch (55 cm) ball. Get a 26 inch ball (65 cm) if you are between 5 feet (1.5 m) 8 inches (173 cm) and 6 feet (1.8 m) 1 inch (185 cm). If you are 6 feet (1.8 m) 2 inches or taller, you will need a ball that measures 30 inches (75 cm). The size of the exercise ball depends on your height and what exercises you plan on doing with it. When you do a dumbbell press on an exercise ball, ensure that your feet can touch the ground firmly.
Choose a larger ball if you have back problems, long legs, or for stretching and yoga exercises.
Get a 26 inch (65 cm) ball if you plan to use it in place of an office chair and your desk height is between 29 and 30 inches (74 to 76 cm). Because the ball will deflate when you sit on it, choose a ball that has a diameter which is 4 inches (10 cm) larger than the height of the chair you are replacing.
Note the pressure of the ball. At its maximum diameter, a yoga ball is very firm. The firmer the ball, the more difficult the yoga and exercise will be.
Try yoga balls in different sizes before making your decision. Sit on the ball and see if your hips and knees are bent to 90 degrees, with your thighs parallel to the floor.
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