You've heard about Orangetheory Fitness. You know that the bright colors and challenging workouts have members singing its praises while sweating their way to results. You've researched its prices. Maybe you've even thought about signing up for a class based on the majorly successful fitness franchise. But if you haven't taken the leap and given Orangetheory's hour-long, heart-rate-based HIIT workouts a chance yet, these impressive fitness transformations will push you through the door.

The extended fat burning of the OTF training principle has made it possible for members to actualize some pretty amazing results. Their stories and their before-and-after photos are not only inspiring but also worth celebrating.