The Instagram star and trainer has built a massive empire with over 4.6 million followers.
The 24-year-old Australian has become Instagram-famous with her Bikini Body Guides. She recently launched an app, too, that essentially puts her training in her fans' pockets.
The star has cultivated an online community that calls itself "Kayla's Army," largely by sharing impressive progress photos (or "transformations") of the women who are committed to her program. It serves as visible inspiration.
These are some of the photos Itsines has shared.