I've been tall and skinny all 20 years of my life, and have always had the belief that I am skinny due to genetics, and that therefore it would be difficult for me to bulk up, even with exercise. It seems to me that all the physically "fit" people were probably born with relatively fit bodies, and they just fine-tuned it through exercise. Or, I think they perhaps used to be fat and worked out to gain muscle. But I've never really heard of a skinny guy working out and gaining a fit, muscular body. I'm not sure how easy this is to determine, but is it as easy/hard as an overweight person losing fat and gaining muscle, or is it easier or harder? And lastly, any tips? Thanks.