Trying to gain weight

I highly recommend speaking with your doctor and working with a dietician. You want to make sure you are gaining weight at the right pace, the right way. Working out, specifically, lifting weights, is a great way to increase your appetite and build muscle. However, you MUST be consuming enough calories and protein otherwise you can hurt yourself. Weight lifting can be a really rewarding and empowering hobby.

I would recommend asking advice from a doctor who is fit themselves, preferably someone who cross trains with weight lifting. You can tell who works out by the shape of their shoulders, their posture, and their calves. Weight training will give you muscle mass, muscle definition, and curves, but you may need additional help from a nutritionist or sports magazine to create a diet plan that appropriately feeds your muscles for gains. I suggest aiming to build and retain 5 lbs of muscle per year, as this is more realistic and safer than aiming for 30+ lbs. Think about it, doctors tend to ask you if you've had an unexpected recent weight gain or weight loss. Such changes often coincides with organ problems, hormonal imbalances, cholesterol, stress, and other issues. Best wishes finding what works for you.