Kayla Itsines

Kayla Itsines is an Australian personal trainer, fitness creator, author, and entrepreneur who became one of the world's most influential digital wellness figures. Born on May 21, 1991, in Adelaide, South Australia, she rose to international prominence through social media by sharing high-intensity interval workouts, encouraging lifestyle habits, and fostering a community-driven approach to health. She is best known for co-creating the Bikini Body Guide fitness program and the global fitness application Sweat.

Early Life and Career Beginnings

Growing up in Adelaide in a family of Greek heritage, Itsines developed an early passion for active sports, including competitive basketball and netball. Although she initially contemplated a career as a beauty therapist, her interest shifted toward exercise science, leading her to graduate from the Australian Institute of Fitness at age 18 as a certified Master Trainer. She began her professional training career at a women-only gym in Adelaide, where she created localized circuit-based workout programs. To track her clients' physical progress, she began posting transformation photos on social media, rapidly attracting thousands of international followers seeking her training methods.

Bikini Body Guides and the Sweat App

Recognizing global demand for her routines, Itsines co-founded the Bikini Body Training Company alongside her then-partner Tobi Pearce. In 2014, they officially released the Bikini Body Guide (BBG), a downloadable 12-week workout program centered around 28-minute high-intensity interval training sessions and balanced nutritional guidance. The e-books became a viral phenomenon across social platforms. To expand access, the pair launched the Sweat with Kayla app in late 2015, which eventually evolved into the Sweat platform. Featuring structured fitness programs, interactive tracking tools, and video demonstrations, Sweat became one of the highest-grossing fitness mobile applications globally.

Public Impact and Personal Life

Itsines' impact on digital fitness has been recognized by major global media outlets. Time magazine named her one of the 30 Most Influential People on the Internet, and Forbes highlighted her as a top social media fitness creator. She has hosted large live workout stadium tours across multiple continents and authored published fitness books. Based in Adelaide, Australia, Itsines married Jae Woodroffe in 2023. She has two children: a daughter born from her previous relationship with Pearce and a son born with Woodroffe in 2023.