Leg workouts, which target some of the largest muscle groups, may have a significant effect on metabolic rate when paired with other forms of physical activity. Leg-stretching exercises, as described on Bodybuilding.com, may stimulate the release of growth hormones, which in turn may cause an increase in muscle mass and overall body size. Aerobic exercise and weight lifting capabilities may both benefit from working on one's leg strength, since a stronger pair of legs translates to greater endurance and stability. Due to the correlation between leg strength and balance, this makes sense. Metabolism Aerobic conditioning workouts for the legs, such...