I am underweight. How do I gain weight and muscle?
Hey I am 15 years old and i am so underweight. I am 5 feet 7 inches and i am 100 pounds. I have tried everything. I have been working out in my home for like 2 years. And I have joined the gym and worked out for 3 months but now I am out. So how could I gain weight and what have i been doing wrong? Please help me.