With countless years of experience in the world of fitness, Jillian Michaels is one of those trainers you can't not listen to. She's done it all, from training celebrities to helping everyday people turn their lives around on The Biggest Loser.
Although it's not likely we'll all be able to train individually with Jillian anytime soon (a girl can dream, though), you can still learn a lot from her Instagram page. She regularly shares sweat-inducing (and totally free!) workout videos anyone can do, and most of them are from her app My Fitness by Jillian Michaels, which offers custom workout routines and meal plans. From booty workouts to core sessions and full-body burners, we've rounded up our favorites to give you some inspiration next time you're at the gym. Don't get mad at us if you wake up sore tomorrow, though. Blame it on Jillian!