When the pain is too much, divert your eyes or even close them. So says a report in the September ’12 Health:
“New research shows that if you look away from the source of your pain, it actually hurts less. Thinking something will hurt less also may make it not as painful.”
Of course, if you’re doing lunges, looking away or closing your eyes may have you running over a bench presser. Be selective with this tactic.