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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. Sit-Ups with Weights, One Hour - Current world record 1. James Clark (Ecuador) did 1,575 sit-ups with a 50lb weight on his chest within one hour on 11 July 2004 at Centro Comercio el Recreo, Quito, Ecuador.     The Book of Alternative records - World records, record breakers and more!