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If you're a beginner this program is TOTALLY doable, but I would caution you to make sure your form is correct, to take your time with each exercise, and to modify the exercises as you need to until you have built up your muscles and strength. I began BBG by doing the “BBG Beginner 1.0” program.

Kayla Itsines' ex-fiancé Tobi Pearce steps down as chief executive of their $400 million Sweat fitness empire after couple split and move on in new relationships. Tobi Pearce is stepping away from the Sweat business empire he founded alongside his ex fiancée Kayla Itsines.

Cost: You can get the "Sweat With Kayla" app free for a week. After that, it's $19.99 (U.S.) a month. Good for Beginners? Not if you're very much out of shape.

Does BBG Work? Yes & No. Yes, because the workouts truly made me stronger and more confident in my workout ability. I had started out with barely any strength to do a pushup, or the stamina to complete 20 jump lunges, and only three months later I was able to complete 20 pushups and 40 jump lunges with ease.

If you're looking to tone up, and not necessarily lose pounds: PWR. PWR is mainly gym-based, with less cardio and more weights. Those aforementioned instagrammers left BBG to create programs that are much more in line with PWR.

Although they didn't list a reason for their breakup, Kayla and Tobi maintain that their split was amicable as they remain “good friends and devoted parents” to their now 3-year-old daughter. The two also noted that while their romantic relationship has come to an end, they still co-own Sweat as business partners.

"The BBG diet is the nutrition component of a popular workout plan. It promotes a variety of nutrient-dense, portion-controlled foods to support weight loss. With no eliminated food groups and an emphasis on overall wellness, experts agree this can be a nutritious eating plan."