I was in the gym yesterday and just about to start a 20 rep set of squats when I got the idea to start counting down from 20 instead of up from 1. I was using a weight that was 10 lbs higher than the week before which I managed to only get 17 with. I always strive for as many reps as humanly possible in the desired rep range but sometimes my mind calls it quits before my body does (mind over muscle) no matter how hard I push. Anyway this worked surprisingly well for me. Just though someone else might benefit from it.