Many weightlifters don't pump enough iron to make their muscles bulge, according to a new study. Research indicates that bodybuilders must heft at least 60 percent of the maximum weight they can lift in order to boost muscle mass. But in a study conducted by exercise physiology professor Stephen Glass, none of the novice weightlifters started their routines at the magic 60 percent mark. The upshot? Weightlifters who skimp on poundage will forever remain girlie-men. "When it comes to strength training, people need to know what is heavy and what's not," Glass said.
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http://abcnews.go.com/wire/Living/ap20040914_1290.html
http://www.wired.com/news/furthermore