After you do several reps and reach fatigue keep the bar up high (next to the rack) and move the bar only 2 - 3 inches. (ashotofadrenaline.net)
Using a mix of several rep ranges with both higher and lower loads will ultimately be best for building and maintaining muscle. (simplyshredded.com)
If you feel little too much blood rushing through your head, you may want to do only several reps or don't consider this strength training exercise at all. (best-basketball-tips.com)