The next time you walk through the gym, take a look at the plates sitting on the bars of the many people training. Notice something? They're all big plates. 45s. 25s. Maybe a few 10s sprinkled in. Think about that for a moment. That means that every time these lifters want to add more weight to a movement (increased strength requires increased muscle!) they have to make a jump in weight on that movement by TWENTY POUNDS! When is the last time you EVER added twenty pounds to any exercise when in the gym? It's rare.