Just running on a treadmill can be hard.
Four guys performing a highly choreographed routine on eight treadmills... now that must take a lot of hard work, creativity, practice, sweat, and determination. The results are fun to watch!
Thanks to Lucky for sending this my way! This video is by a group called "OK Go". I have to say that I have never heard of them before today, but if you want to know more about them click here to visit their website.