Birthday girl Carrie Underwood showed off just how in shape she is on The Tonight Show Starring Jimmy Fallon.
Of course, Underwood blew out of the water with her fitness skills when they competed against each other in a series of exercise games to determine who is the fittest of the fit. After all, the "Remind Me" songstress was there to promote her new fitness book Find Your Path: Honor Your Body, Fuel Your Soul and Get Strong with the Fit52 Life.
The first challenge to determine who would take the title home was a course called "The Hang 10," where the two had to race against a court on all fours matching their hands and feet to the respective pictures on the floor. Fallon compared it to a "Dance Dance Revolution meets Twister." It was all downhill from there for poor Jimmy! Enjoy!