I am currently a college student and been around the weightroom for awhile and thanks to T-Nation, have made some quality gains. Recently, I have noticed that our football team's program involves lifting with 25 pound chains on each side of the bar. They say it helps with explosion because as the lower the bar the their chest the weight gets lighter as the chains hit the floor. What do you guys think of this, is it effective. Should I consider trying this to gain some bench strength.