Bikini Body Guide (BBG) eBooks – Kayla Itsines Starting with my Bikini Body Guide is SO simple! Each workout during the 12 weeks is presented in a basic format, making it easy for you to get started right away. The program begins with smaller challenges, then ramps you up over the following weeks, to higher levels. This allows your body to continue adapting, and helps to avoid plateau.Shop · Free Workouts · Recipes · Weeks 13-24 · Sweat With Kayla Kayla Itsines - Sweat With Kayla Kayla Itsines. I’m Kayla Itsines, co-creator of the Bikini Body Guides (BBG). I’ve been a personal trainer since 2008 and in that time I’ve educated and encouraged millions of Best Foods To Eat When You Have Your PeriodFree BBG Workout To Get You Ready For The 12 Week ChallengeThe Best Warm Up Exercises And RoutinesHow To Activate Your Glutes Before A Workout!5 Best Post Workout StretchesIs Cardio Or Weight Training Better For Weight Loss? Bikini Body Guide - My Review And Why I Didn't Buy It! About to buy Kayla Itsines Bikini Body Guide? DON’T! What I found out about the Kayla Itsines Bikini Body Guide might shock you!. Hi, my name is Amanda and I’m a mom of 2 adorable boys and I’m also a carer for my mother who is restrained to a wheel chair after a horrific car crash 3 years ago.