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.
If you want to lose weight, you need to two things: eat less and exercise more. Weight gain happens when you create a calorie surplus (eat more than you burn). Your body takes the excess calories and converts them to fat which get stored around your stomach, arms and thighs.