Cassey Ho is the founder of Blogilates, the #1 female fitness channel on YouTube. Parvati Magazine caught up with her to talk about fitness, fun and transformation. Parvati Magazine: In your opinion, what makes Pilates so transformative? Cassey Ho: Pilates will transform your body because it teaches you how to move functionally while building strength, gaining flexibility and improving posture. It makes you fitter for LIFE. Pilates focuses heavily on the core - your powerhouse, where all your strength comes from.