I play high school baseball. I wanna make my next year memorable on varsity and not just dead weight. I wanna know what I can take to get more muscular. I'm about 5'7 140lbs (on a good day). I'm really skinny which is partly because i run alot (cross country). I have whey protein but I wanted to know what can help me gain alot of muscle. Lifting and everything. Note: I don't wanna lose speed because i run cross country too.