What builds more muscles – weight or repetitions? – The Chart - CNN.com Blogs

What builds more muscles – weight or repetitions? – The Chart - CNN.com Blogs: "Straining and groaning under a heavy weight to pump those muscles might be unnecessary, according to a study released from a Canadian university.

While body builders and muscle fanatics may load up their weights, it could be just as useful to use a lighter load, but do more repetitions until the muscle becomes tired, kinesiologists at McMaster University suggested."