Here's a book review from The Guardian that might be of interest:

Running: A Global History by Thor Gotaas

http://www.guardian.co.uk/books/2010/jan/03/running-long-distance-global-history

I haven't read it yet as I'm vowing to complete more of the many unread books on my shel before spending more money on books, but it looks really interesting. Here's an excerpt from the review by writer Christopher McDougall:

"Gotaas's span begins with prehistory, arguing that because of our sweat glands and springy leg tendons, humans are the greatest distance runners on earth. Our tremendous efficiency at venting heat and maximising caloric energy allows us to run big game to death by chasing them across the savannah until they collapse from heat exhaustion. Access to meat allowed us to grow big brains, while tracking animals allowed us to use this cerebral hardware to develop abstract thinking, verbal communication and cooperation strategies, the mental skills we'd later use to come up with intravascular surgery and iPods."

Two Miles

Today I ran two miles. I was supposed to run a marathon. I had my sights on the Rock 'n Roll Arizona race in sunny Phoenix, and I was hoping to use it to qualify for the 2012 Olympic Trials Marathon.

Instead, I tied up my laces in partly sunny Bloomington, Ind., jogged out seven minutes and thirty seconds, and turned around. My stomach gurgled. My throat burned. My feet shuffled.

Not exactly what I had envisioned for this day when I was making my training schedule a few months ago; yet, I couldn't help but recall past times when injury would leave me wishing for nothing more than a two mile jog.

Just as I was getting back in to the swing, and the physical pounding, of serious marathon training in late October, I started having gastrointestinal issues. At first I thought it was something I ate, then maybe a stomach bug, perhaps a food allergy.

But a few doctor visits, some blood samples, some other samples I’d rather not discuss, an ultrasound, a colonoscopy, and a three-hour series of x-rays after drinking 20 oz. of barium, I am still having problems. Thank goodness I have COBRA insurance from my former university job, or both my stomach and my wallet would really be hurting.

Sometimes I get confused - am I 25 or 65 with all these medical issues? I have a follow-up visit to the gastroenterologist in early February, which was the earliest appointment he had to discuss the results of the x-rays, which I had on Dec. 29. Five weeks is a long time to wait when running, eating, sleeping, walking, sitting and existing in general are made constantly uncomfortable.

Nonetheless, I am afraid karma will come to get me if I complain too much (I’ve been watching a lot of episodes of Lost lately). It can always be worse. How many people didn’t, and couldn’t, run two miles today? Not I.

So now I will go watch more Lost to distract myself from the fact that I can't run as much as I would like. And who knows, maybe tomorrow I'll be able to get in three miles.