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2. Baoding balls - Wikipedia

   en.wikipedia.org/wiki/Baoding_balls

   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.

3. Exercise ball - Wikipedia

   en.wikipedia.org/wiki/Exercise_ball

   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.

4. Space hopper - Wikipedia

   en.wikipedia.org/wiki/Space_hopper

   The space hopper is a heavy rubber ball about 60–70 centimetres (24–28 in) in diameter, with two rubber handles protruding from the top. A valve at the top allows the ball to be inflated by a bicycle pump or car tire pump. A child can sit on top, holding the two handles, and bounce up and down until the ball leaves the ground.

5. Stress ball - Wikipedia

   en.wikipedia.org/wiki/Stress_ball

   A stress ball in the shape of a globe. A stress ball or hand exercise ball is a malleable toy, usually not more than 7 centimetres (2.8 in) in diameter. It is squeezed in the hand and manipulated by the fingers, ostensibly to relieve stress and muscle tension or to exercise the muscles of the hand. Despite the name, many stress balls are not ...

6. BOSU - Wikipedia

   en.wikipedia.org/wiki/BOSU

   Two people in a gym using BOSU balls. 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 ...

7. High-g training - Wikipedia

   en.wikipedia.org/wiki/High-G_training

   The 20 g centrifuge at the NASA Ames Research Center. High-g training is done by aviators and astronauts who are subject to high levels of acceleration ('g'). It is designed to prevent a g-induced loss of consciousness (g-LOC), a situation when the action of g-forces moves the blood away from the brain to the extent that consciousness is lost.