Muscles worked: lower body
Purpose: speed and agility
Form: You begin a mountain climber similar to a push-up. Your hands and arms are on the ground, about shoulder width apart. One leg is bent, tucked under your torso while the other leg remains straight and behind your body (a.k.a. runner’s lunge position). Keep your head in line with your torso and your abdominals contracted throughout the exercise. Begin the mountain climber by quickly alternating legs and continuing the movement for several seconds. The aim is to bring your knees in toward your chest as you perform the alternating “climber” motion.