This is the moment an amputee skier carved down a snowy slope—swooping side to side on one leg like an absolute pro. Wendy Gideon, 42, is a congenital amputee, meaning she was born without a leg.

With two new legs to stand on, Dymtro Dimakrasnovskye put all his effort into making a single step. “The most difficult ever for me was to make that first step,” the 24-year-old, double-leg amputee ...