Marathon knit

If knitting on your couch isn't enough of a challenge for you, how about trying to knit a scarf while running a marathon? Just figuring out the logistics--or not automatically felting the yarn from the sheer amount of sweat, water, and heat--seems like a sufficient challenge.

There are also details on some of the other ridiculous things some people are attempting to do in the London Marathon. Come on, isn't running 26.2 miles hard enough?