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 (sometimes abbreviated to BBG) and a meal-planning and workout app, Sweat with Kayla. Sweat with Kayla generated more revenue than any other fitness app in 2016. In March 2016, Time named her one of the 30 most influential people on the Internet, noting her success at leveraging social media to promote her brand. As of October 2016, Itsines had eight million followers on Facebook and five-and-a-half million on Instagram. Her Facebook followers had liked her content 7.7 million times. In October 2016, Itsines and her partner Tobi Pearce were included in the BRW "Young Rich" list of the wealthiest Australians aged under 40 who had not inherited their money. Their fortune was reported at $46 million.