bosu ball

== English == === Alternative forms === Bosu ball, BOSU ball, Bosu trainer === Etymology === Partial genericized trademark from BOSU, an acronym for "Both Sides Utilized" describing the two usable surfaces (a flat platform and inflated dome) of products like the BOSU Balance Trainer, plus ball. === Pronunciation === IPA(key): /ˈboʊsu ˌbɔl/ === Noun === bosu ball (plural bosu balls) A piece of exercise equipment with an inflated rubber dome attached to a rigid flat platform, used for balance training, strength exercises, or rehabilitation. ==== Coordinate terms ==== balance board, rocker board exercise ball, yoga ball, stability ball