Mountain Climbers
1. You begin this exercise in a pushup position – your weight supported by your hands and toes.
2. Flexing the knee and hip, bring your right leg forward until the knee is approximately under the hip. This is your starting position.
3. Next, explosively reverse the positions of your legs, extending the right leg until the leg is straight and supported by the toe, and bringing the left foot up with the hip and knee flexed.
4. Repeat in an alternating fashion for about 30 seconds. You should feel a good burn in the upper thighs.