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.
Slimming your legs and thighs may require a combination of diet, cardiovascular exercise and resistance training. The legs and thighs can be one of the most unsightly areas to hold excess weight. Directly training these areas can improve their appearance but will not remove fat from the areas in question. Contrary to popular wisdom, spot reduction of fat is impossible. To lose weight in these areas as efficiently as possible, you'll have to adhere to a regimen of diet and cardiovascular exercise as well.