The latest fitness trend on Instagram (and on the beach) are fitness star Kayla Itsnine's Bikini Body Guides, known to fans just as "BBG." When the guru regrammed a pic showing the progress of Liza Parker, a 29-year-old BBG devotee in Ontario, Canada, people on the Internet launched a debate over whether or not she's for real.

With Kayla herself calling out Liza's "#bootygainz", people were jealous, and therefore dubious. Liza's fans are coming out with science facts to her defense.