Fitness, Check. Education, Check. Great Vlogs, Check. Stephanie has it all. Working as a cancer research scientist while maintaining an active lifestyle, this girl is no stranger to spinning a lot of plates. Having obtained her PHd, you already know that all her information shared is science based. Stephanie shows some great videos on combining calories with working out to reach your desired goal. Her channel is fun, honest and very motivating and has 900K followers.