Wow Kate, I didn't know that but now I have done it I plan to do it every time I hit the treadmill or go for a walk outside like today! I felt so powerful! I have never been able to run, always too fat and awkward. Even when I started my journey and was walking 6km a day, I couldn't run further than white guide post to the next one, about 20 metres! I felt pretty disgusting and so was happy just to walk fast. I also never wanted anyone to see me run, stopping and starting, red faced and out of breath, really struggling holding my side with a stitch, too embarrassing!! So I was too scared to even try even though I knew my fitness level was much improved but today I felt like such a fat slug, not going to the gym and eating too much (bloody nuts I tell you, my undoing!) I decided to just try, and just to keep going, every time I wanted to stop, I told myself keep going, you're not in pain (and I wasn't, no stitch at all), you're doing great, keep going. The only thing that was painful was the very very cold air in my lungs.....that hurt and I coughed and coughed when I got back..lol. I know my hips will hurt tomorrow, but I don't care it was worth it!!!