Let's make this birthday one to remember.

39 years old (Born on January 16, 1987)

Happy Birthday, Cassey! You're the queen of Pilates who somehow makes us smile while our abs scream for mercy. From inventing Pop Pilates to building Blogilates into YouTube's largest female fitness channel—your energy and creativity have inspired millions (and made leggings a wardrobe essential).

Your recent Bodypop Activewear collections are absolute fire; stylish enough that we almost forget we're sweating buckets mid-workout. Thanks for keeping workouts fun, fierce, and fabulous all these years. May your birthday be filled with laughter, cake (calories don't count today!), and endless reminders of how much you're loved by fans worldwide. Keep popping strong!