It's official, folks: "Loosen Up That Groin For The Weekend" is the sleeper fitness viral video of the Fall. We've all been there: you're eating something unhealthy when a fitness video pops up on your Facebook feed. FML! But every once in a golden while, a video like this one from CaliSpine pops up and you're not sure if you're watching a fitness video or something totally inappropriate for the workplace.