I find that the mantras I like to use are mostly positive things. Things like "I am a freakin' machine" and "I don't feel no hill!" My wife is a negative thinker. She tells herself things like "get your lazy butt moving" and "hurry up slow poke" and "sure, I guess I'll settle and just marry this guy." Negative thoughts.
My conclusion from this is that men, with our over-inflated egos tend to use positive mantras, "I'm an animal" while women, who are conditioned by society to think they're not skinny enough or not pretty enough tend to use negative mantras. Granted, my scientific research on this matter consists of surveying only 2 people (me and my wife) but so far it's 100% accurate. I'm going to attempt to post a poll below so that you can vote and we can have a bigger sample size. I figure if all my readers vote we could get upwards of 10 votes! Normally I'm not a big advocate of women voting but in the interest of science I'll let it slide today, so you gals don't worry your pretty little heads about it and vote.
After you vote let me know in the comments if you think that I'm right. If you think that I'm wrong, keep it to yourself. No one likes a negative Nancy.
That's all I got for today, I'm off to go get my run on. Oh, and I'm just kidding ladies.