qqp question1: I'm a 13 year old boy. I'm 5.5 feet tall and I weigh 135 pounds. How do I lose weight and exercise more? question2: I'm a 14 year old boy who is around 5.8 and I weigh about 106 pounds. I go to the gym and do weight training 3-5 times a week and eat lots of food. Am I under weight? If so, how do I gain weight?