Kayla Itsines born 21 May 1991 is an Australian personal trainer, author, and entrepreneur.
She is the creator of a series of fitness ebooks titled Bikini Body Guides, and a meal-planning and workout app, Sweat with Kayla.
Sweat with Kayla generated more revenue than any other fitness app in 2016.
At only 25, Itsines is the most influential fitness star in the world, selling out stadium tours in an hour.
According to Forbes. Her “Sweat With Kayla” app generated $17 million in revenue last year, according to App Annie.