WARRIOR I Stretches hamstrings while working glutes and quads and opening up the chest. "There's a sense of strength to it," says George. ADVANCED FRONT PLANK "This exercise is one of the hardest to hold," George says. It strengthens the arms and wrists while also working the abdominal core, which keeps him balanced while he has an arm and a leg in the air. TRIANGLE Stretching exercise targets legs, abs, hips and spine. Says George, "This also builds Hilary's biceps since she's holding me up in case I start to tip." WARRIOR III "It's hard to get my arms up where they need to be if they're sore from practice or a game," says George of a pose that strengthens the legs and the back while toning the abdomen. "You need to focus on a spot on the floor to balance."