A fitness training device consisting of a rubber dome attached to a rigid platform, creating an unstable surface for balance training and functional exercises.
BOSU is an acronym for 'Both Sides Up' or 'Both Sides Utilized,' referring to its ability to be used dome-side up or platform-side up. Invented in 1999 by David Weck, combining 'ball' (Old Norse 'böllr') with the concept of instability training.
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