The best way to get stronger legs is by riding a horse. Horse riders need strong legs for balance, cueing, safety and an overall better ride. Strengthening your legs will improve your balance, and coordination. At the same time it will boost your metabolism so you burn more calories. For instance, if you are riding your horse for 20 minutes a day, you will burn about 100 calories. When you strengthen your legs, you are increasing your muscle mass, which will improve your stamina.