When it comes to bucket lists, there are a few things that seem to pop up pretty regularly. For example, it is common for people to dream that they’ll one day go skydiving, travel through Europe, swim with sharks, or run a marathon. This last one is somewhat surprising considering how few people actually apply themselves to improving or maintaining their fitness. Let’s face it—you don’t just make up your mind to run more than two dozen miles, then step out the door and do it. It takes commitment and preparation.