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25.05.2026 New claim submitted for Backwards Stair Climbing, 1 Hour 09.05.2026 New claim submitted for Mental Calculation, Division 09.05.2026 New claim submitted for Mental Calculation, Square Roots Keywords: (e.g football beer mat)	Listed below are the verified claims for the record listed. Whistling Marathon - Current world record 1. Jennifer Davis (Canada) whistled for 24 hours at the Impossibility Challenger Games in Dachau, Germany on 2/3 October 2010.     The Book of Alternative records - World records, record breakers and more!