I tried and failed to get into running on my own for years, until one day I went running with a colleague, who was also a seargeant in an Asian national army, a

I tried and failed to get into running on my own for years, until one day I went running with a colleague, who was also a seargeant in an Asian national army, and regularly ran two marathons in a day. The first thing he said is, you are running too fast. You should run slowly enough that you can breath regularly, or you will never last. So, I slowed down, and I can do 12k an hour or so, which is pretty fair, but I only ever go for a max of two hours at a time. I find it incredibly meditative, and use it as my creative problem-solving time. One tip though, NEVER run on your heels. Get some barefoot shoes or just concentrate on not doing it. You lose the spring in your angle and knees, and just bang the hell out of your joints.