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An exercise ball is a ball constructed of soft elastic, typically in 5 diameters of 10 cm increments, from 35 to 85 cm (14 to 33 in), and filled with air. The air pressure is changed by removing a valve stem and either filling with air or letting the ball deflate.
An average user should be able to start with a 45 mm (1.8 in) ball and move up to 60 mm (2.4 in) as their muscles get accustomed to the exercise. Larger Baoding balls between 70 mm and 100 mm (2.8 in to 3.9 in) can be used. Keeping larger balls separate while rotating them is an advanced skill.
A BOSU Balance Trainer (or BOSU ball) is a fitness training device, invented in 1999 by David Weck. [1] It consists of an inflated rubber hemisphere attached to a rigid platform. The device is often used for balance training. When the dome side faces up, the BOSU ball provides an unstable surface while the device remains stable.
Sepak Takraw balls without synthetic rubber covering must have 12 holes and 20 intersections, must have a circumference measuring from 42 to 44 cm (16.5–17.3 in) for men or from 43 to 45 cm (16.9–17.7 in) for women, with a weight that ranges from 170 to 180 g (6.0–6.3 oz) for men or from 150 to 160 g (5.3–5.6 oz) for women.
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