Named the number one fitness influencer by Forbes Magazine, Kayla Itsines has truly become an international phenomenon. After successfully launching her Bikini Body Guides in 2013, Kayla went on to launch her very own fitness app and amass over eight million Instagram followers, twelve million Facebook fans and a legion of ladies looking to attain a bikini worthy physique and credit her with changing their lives. The college dropout turned entrepreneur has been a female-only trainer since her days working at a local gym in her hometown of Adelaide, Australia and has just released her second book The Bikini Body Motivation & Habits Guide. Kayla’s empire is reportedly worth $46 million. Not bad for someone who just started off showing her client’s progress on Instagram.