balance board
noun
: a board that is mounted on a rounded fulcrum and used for various exercises and feats of balance
… up to 30 students at a time are performing yoga stances in unison, stretching, shadow boxing and running in place, all on special balance boards.—Bob Fowler, Knoxville (Tennessee) News-Sentinel, 3 June 2010
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Merriam-Webster unabridged
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