That's right, there's such a thing as 'knitting marathons'. I just found out about them myself.

Above is a picture of David Babcock, who ran the Kansas City Marathon in 5 hours 48 minutes 27 seconds while knitting (back in October of 2013). He ended up with a 12 foot 1 3/4 long multi-coloured scarf that broke the world record. More about it here.