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Callan Welder found river paddling boring until he tried shuttling through Appalachian white-water prone and headfirst, using his arms to propel him. Mr. Welder, 39, owns an acupuncture practice in Marshall, N.C., near the birthplace of Bellyaking, a sport that combines elements of kayaking and surfing.

The sport was pioneered in the early 2000s by Adam Masters when he duct taped the seating area of his kayak shut and laid belly…