http://jap.physiology.org/cgi/content/full/89/3/1061 http://jap.physiology.org/content/vol89/issue3/images/large/dg0900178001.jpeg This seems to imply that strength is directly proportional to height, and is a more important factor than weight. More importantly, this relationship holds up to 180lb for lifters, and that anyone beyond this weight experiences greatly reduces efficiency in terms of height/weight to strength ratio. Not that most of the people in the study are around 5.5 feet. Basically, it says that each person has a "soft limit" on strength, and that limit is highly correlated by height. Adding more muscle mass helps greatly up to a certain point only. I presume for a 6 foot person, this probably translates to something like 215lb as the optimal weight. I just skimmed parts of it so thats the meaning i got from it. Kindly interesting it seems.