I'm a 14 year old boy that is very skinny. I am of average height and I don't know if I'm going through puberty yet. I don't have any equipment, so I just want someone to give me a good training course that I could do to get some muscles on my bones. I don't have any particular sports that I like, because I'm not athletic.
I just want to increase muscle mass. Help?
I just want to increase muscle mass. Help?