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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.
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.
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Circle rules football, commonly referred to as circle rules, is a team sport played between two teams of six with a large spherical ball similar to a stability ball. Invented in New York City in 2006, [1] the sport is currently played in cities across the United States, as well as in several international locations. [2] [3]
Exercising with a medicine ball Medicine ball plank Man exercising with a medicine ball. A medicine ball (also known as an exercise ball, a med ball, or a fitness ball) is a weighted ball whose diameter is about a shoulder-width (approx. 350 mm (13.7 in)), often used for rehabilitation and strength training. [1]
The yo-yo is an example of a skill toy. A skill toy is an object or theatrical prop used for dexterity play or an object manipulation performance. A skill toy can be any static or inanimate object with which a person dances, manipulates, spins, tosses, or simply plays.
The stability radius of a continuous function f (in a functional space F) with respect to an open stability domain D is the distance between f and the set of unstable functions (with respect to D). We say that a function is stable with respect to D if its spectrum is in D. Here, the notion of spectrum is defined on a case-by-case basis, as ...
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