She's a NESTA and AFAA-certified trainer, black belt in Muay Thai and Akauri-Do, and creator of the My Fitness by Jillian Michaels app. Jillian is basically a household name when it comes to fitness, and her YouTube channel features a variety of workouts, informational videos about her app, and more.
Instagram: @jillianmichaels
YouTube: Jillian Michaels