Answer Wiki. The system would be cued off the pilot's helmet, so it will definitely look where your head is pointing, not your eyes specifically (that would be a gaze-tracking system, which AFAIK hasn't yet been used for this kind of application).
Exercise to Gain Leg Weight. Although you can't make your body gain weight in your legs, you can perform exercises that encourage the growth of leg muscle. Squats, lunges and step-ups are examples of such moves that target the legs and recruit a lot of muscle fibers for growth.
Target your legs with other exercises. There's a host of great exercises that you can do to help burn fat and build muscle. Here are just a few of them: Lunges. With a 5 or 8-lb (2 or 4 kg) dumbbell in each hand, lunge forward with one leg and bring the opposite knee about an inch above the ground.