Fouad Abiad explains the leg press annhilation: 

"Here is one of the sets from my last leg workout. After five sets on the leg press of twenty reps each, I like to do one heavier set and then strip it down to the starting weight again.  It’s a great way to make sure you’ve really taxed your quads and left nothing behind.  Remember, this was the first exercise in that leg workout! It was almost a four-minute set and left me messed up for the rest of my workout.  This is the kind of thing you have to be willing to do if you want to break plateaus and build new muscle."

Sacrifice Without Regret,

Fouad ‘Hoss’ Abiad