Skiing is quad dominant, which can lead to a strength imbalance with the butt and the backside of the leg. The Poor Man's Leg Curl trains the hamstrings and butt on the backside of the legs, decreasing the chance of injury.
Lay face-up and place the heels of both feet on a bench, box or chair. Move your butt into the bench so there is a 90-degree bend in your knee. Place your hands at or behind your head. Press your heels into the top of the bench and drive your hips to the sky until they are fully extended. Drop back down until your butt touches the ground. Repeat 25 reps.