Worried about health? Long life? Of course not.  I started lifting weights because I was a tall, skinny, awkward kid occasionally picked on by bullies. I had the normal desire of 12 year old boys all over the world to look tough and strong, be popular, and, most of all, popular with the 12 year old girls.  Maybe even a 13 year old girl. 

Did it work? Yes and no.  I did gradually get stronger and more muscular.  I did well, though not spectacularly well,  in sports, and was on the wrestling, basketball, and track teams. I even eventually became co-captain of my high school football team.  Sadly enough, the girls hardly seemed to notice.