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.
The BOSU ball was invented after David Weck cut a stability ball in half and attached it to a platform - he wanted to create the instability benefits of ball training while eliminating the risk of the ball rolling away during exercises!
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