These 18 Influencers Are Changing Women's Fitness

With 4.4 million followers on Instagram, you'd be hard pressed to find a young woman in fitness who hasn't heard of Kayla Itsines, or at least BBG — her Bikini Body Guides that sparked social fitness phenomenon, with an obsessed and dedicated community of fans. Kayla's e-guides were so popular that she created the app, Sweat With Kayla, where users can subscribe monthly to workouts on their phone or tablet.