Though I am a straight powerlifter, I have friends who are crossfit freaks and I have turned them all to the Westside Dynamic System for lower body only. After they saw me jump to me feet from knee postion with 215lbs barbell on my back (230lbs now) they couldnt believe it and ask how I am so explosive and fast in both my esentric and concentric movements. I told them there's more to lifting then just picking up a weight and doing some crap here and there, Its science, math, biomechanics. After a long explanation on bands, chains, and weight releasers, they finally gave in and tried it one time, and after that they where sold!!!!