Christopher Adam Bumstead (born 2 February 1995), also known as CBum, is a Canadian professional bodybuilder. Bumstead made his competitive debut in 2014 and obtained his IFBB pro card after claiming the 2016 IFBB North American Bodybuilding Championship. After placing second in the Mr. Olympia Classic Physique category in 2017 and 2018, he earned six consecutive wins from 2019 to 2024, the most wins since the creation of the category. He is widely considered to be the greatest Classic Physique bodybuilder of all time.

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