BBG is an acronym for the popular workout program, Bikini Body Guide, created by fitness sensation Kayla Itsines. Some synonyms for BBG may include "fitness challenge," "strength training," or "workout program." Others may refer to it as a "fitness routine," "fitness plan," or simply as "Kayla's workout." People may also use variations of BBG such as "Bikini Body Guide workout," "BBG fitness program," or "BBG exercises." Regardless of what it's called, BBG has gained a massive following and has been praised for its effectiveness and accessibility to people at all experience levels.