Kayla Itsines is an Australian trainer, author, and entrepreneur. In 2016, she was recognized by Times as one of the 30 most influential people on the Internet. Her well-known app— Sweat with Kayla— generated more revenue than any other fitness app in 2016. As of now she already has 11.8M followers with whom she shares content about workouts and a healthy lifestyle. Kayla also has her own website, where you can sweat with her, as well as a personal blog full of useful information about everything fitness.