BOSU

Single-leg balance on a BOSU Stand on one foot on the dome for up to a minute, knee slightly bent as if in a ski stance. The wobbling surface forces the ankle, knee and hip to make the constant small corrections that uneven snow demands, and balance pays off in technique and stamina alike, since a skier or rider who is slightly off balance strains the legs fighting to stay upright. Once it gets easy, close your eyes, catch a tossed ball or add small hops. Three one-minute holds a leg fit at the end of almost any session.