The Fitness Marshall Wants You to Dance, Dance, Dance to This Epic Justin Timberlake Jam

We’re sure you’ve noticed our not-so-subtle obsession with Caleb Marshall, aka The Fitness Marshall. We first fell in love with this YouTube dance cardio trainer when we spotted the “Work” by Rihanna routine. Since then, we’ve been dancing our booties off with him at home. We got a chance to chat with Caleb, and learned…