You just cross over into the last 10 minutes of your workout. Your muscles are burning. You're sweating rivers. Your lungs feel like they're going to explode. What are you thinking about? What gets you through that last few minutes?
I agree with Anna. Also, for me sometimes, I'll quit counting(if I was in the first place) and start screaming random song lyrics.... in my head so I don't freak my children out They already stare at me funny when I work out hahaha