exercising is a good way of gaoining some good weight, mosty of the time ppl think that exercise is good for weight loss, bt they dun really link it to weight gain , which is wrong , you must exercise , and eat a good high protein + carb snack before and after your workour, having protein shakes post exercise is alos a gud way of gaining some muscle. start your day with egg nogs, if you are a vegetarian , you can keep skimmed milk powder, and mix it with all food itemms possible , like you can mix it in your glass of milk or mix it to you dough, or to a veggie. it does not increase the quntity of food, but definately increase the nutritional quality and protein content of the food.