Mainly weight loss, but now it is an integral part of my life. Whenever I feel tired in a race or training, I say to myself that I can't throw away what I have achieved that day, and in a sense, keeping running is the same over a longer time period: I've been running now for nearly two years, and four stone down, and so much fitter, I want to maintain what I have done so far.
I love the idea that on Sunday, I will be running further than I ever have (15 miles this week), and I know I can do it: headphones on, in the countryside, and zoned out. At the end, I am properly knackered, but endorphins are kicking in, and I can feel smug all day!