Running Rocks!

I was back on the treadmill today and had a great workout! Surprisingly I run faster of my own accord then I do on the treadmill. I wonder if this is covered in a sports psychology class because I would love to know why that would be. Maybe because I'm timing the laps or maybe because I have no idea how fast I am going until I am done. Either way It is a sign that I should either be turning up the speed on the treadmill or running outside more often.