Exercise ball

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

An exercise ball is a ball constructed of soft elastic, typically in 5 diameters of 10 cm increments, from 35 to 95 cm (14 to 37 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.

Excerpt from the Wikipedia article “Exercise ball”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: www.localfitness.com.au, CC BY-SA 3.0, via Wikimedia Commons.