Keep it Simple Stupid:

My high school basketball coach used to tell us to "Keep it simple stupid." Too often we try to over complicate things, which is all to easy to do in our everyday life and activities like basketball ect... One of the things that I like the most about running is its simplicity.

You only have to worry about running...right? Well, yes but there are a lot of other factors that play into it, especially when you are working towards a specific fitness or performance goal. It is easy to get caught up in

VO2 max
Heart rate training,
Strength training
Cross training
Long runs
Tempo runs Speed work
Should I be doing Yoga? Everyone else seems to be doing it.
I'm not even going to get into barefoot running.

Then there is nutrition, injury prevention the list goes on and on. Sometimes we need to focus just getting out there and running and covering the basics and try not to over complicate things.
Here is a good article from Ultrarunning magazine about sticking to the basics and keeping it simple.

UltraRunning Article: Enjoy!