People love their pets…and sometimes love their exercise. Put them together and you’ve got yourself a hilarious viral video.

The American Pet Products Association (APPA) reports that people in America spend over $50.84 BILLION dollars a year on their furry little friends. With all of the toys, food, and clothes people are buying for their pets, it seems like people are wanting to make sure they stay active and fit as well.

Prepare Yourself for the 2012 Guinea Pig Olympics [PHOTOS]

With hundreds of YouTube videos being posted of dogs, cats, mice, hamsters, and even a shrimp(?!) running on treadmills, it’s starting to become a little internet sensation. Videos of these animals running their little hearts out average around 1,000 views and some even get up into the 100 thousand mark. There must be something about these cute little guys running that makes people want more… Checkout some of the best below!