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.
How to do it: Lie on left side with knees slightly bent, heels together. Rest head on left arm and look straight ahead. Hold a 3- to 5-pound weight on outside of right thigh. Keeping feet together and abs tight, squeeze butt and raise top leg (knee pointing up) as high as possible without rocking body as you lift.