Just get off the couch and head out for a run!
Budapest:
While visiting Budapest I decided to do a Running Tour via runningtoursbudapest.com! It was a great way to see the city from a different vantage point. I met my guide and we ran together for my customized tour. There is a variety of options for the type of sites you want to see- I just had the Running company customize a 9 mile tour for me. Since Budapest is fairly small, we ran all over the city! Prices vary depending on how many people are in your group- but I paid about $50 for my personalized 9 mile run. It was great!