I would suggest reading The Poliquin Principles (http://www.amazon.com/Poliquin-Principles-Successful-Strength-Development/dp/0966275209 http://www.amazon.com/P

I would suggest reading The Poliquin Principles (http://www.amazon.com/Poliquin-Principles-Successful-Strength-Development/dp/0966275209 http://www.amazon.com/Poliquin-Principles-Successful-Strengt...) It provides a great insight into not only the difference between light and heavy weight but also reps and timing.