Happy first day of Spring! It has been a tough winter, and you probably haven't been hitting the gym as much as you'd like. No one has. But this 15-minute, equipment-free session will get your body's engines revved up, work all of your major muscles and leave you feeling energized. It's a level 4, so if you need something easier, visit www.inmotionworkouts.com where we are beta-testing our brand new software (totally free of charge).