8 Fitness Entrepreneurs Who'll Give You Serious Instagram Inspiration

Followers: 10.4 million
About her: Kayla Itsines is the one-woman machine behind the BBG mania that's taken over Instagram. The Australian trainer started off simply sharing tips on how to achieve a lean physique, went on to create the Bikini Body Guide for her growing following, and is now the founder of the popular Sweat app — which includes, yoga, weights and HIIT workouts, as well as food plans and healthy recipes.