Hello everyone, I started going to the gym recently (around 2 weeks ago) and this morning I had the feeling I was doing it wrong. My goal is to gain muscles and gain weight (especially my upper body). Since I am a small guy, 1m65 (5ft.5) and only 53 kg (116,8 LB) it's very important for me to not lose any weight. I know food is very important but since I am 17 and still living at home I can't choose the food. Another problem is that I am overdoing it. My arms are still stiff from 2 days ago. Some People say it's good, others say it's bad and I don't want to get injured ofcourse . So I want to ask if anyone has any tips how to improve this or exercises that would be good? -Tiggerstrico PS. I have to say that working out really helps during this journey, and recommend it to everyone.