Recently learned this from my Dad actually, he said it was a common lesson in P.E. http://www.buildleanmuscle.com/weight-lifting-pyramid.html As I understand it this is supposed to give strength+endurance, each time I've lifted with it I tend to push myself farther than with any other routine (5 sets of the same weight, for example). I was told this is because the muscles get fired up through the early sets in the pyramid, allowing for better lifts once you hit the heavy reps. If you look at any teen-early 20's guys they use routines completely different from pyramid technique. There's also the reverse pyramid, starting with higher weight lower reps etc. I'd like to try that too. My dad has done alot of logging in the past 20 years, he is for a 45 year old and can perform multiple pyramids.