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  2. Exercise ball - Wikipedia

    en.wikipedia.org/wiki/Exercise_ball

    Some dumbbell exercises, such as dumbbell fly can be performed on a ball. [10] Ball exercises are popular among runners. [11] Most frequently, the core body muscles; the abdominal muscles and back muscles are the focus of exercise ball fitness programs. [12] Using an unstable surface recruits more muscle units without increasing the total load.

  3. Gyroscopic exercise tool - Wikipedia

    en.wikipedia.org/wiki/Gyroscopic_exercise_tool

    A gyroscopic exercise tool is a specialized device used in physical therapy to improve wrist strength and promote the development of palm, wrist, forearm, and finger muscles. It can also be used as a unique demonstration of some aspects of rotational dynamics .

  4. 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.

  5. 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.

  6. 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 ...

  7. Rupture disc - Wikipedia

    en.wikipedia.org/wiki/Rupture_disc

    A rupture disc (burst) Pressure-effect acting at a rupture disc A rupture disc, also known as a pressure safety disc, burst disc, bursting disc, or burst diaphragm, is a non-reclosing pressure relief safety device that, in most uses, protects a pressure vessel, equipment or system from overpressurization or potentially damaging vacuum conditions.