Jessica Alba is a fan of Kayla Itsines, and she’s not alone. The fitspo Instagrammer has some 4.3 million Instagram followers thanks to her patented Bikini Body Guide insta-workouts. Now, the HIIT maven from down under is taking on the tech world: Released earlier this month, her new iOS app Sweat With Kayla is already taking iPhones and iPads by storm.

Kayla Itsines app

Our friends at well+GOOD reviewed the app, which includes a combination of meal plans, health information and, of course, workouts. They report that while the moves aren’t too involved, they’re “challenging enough to get even advanced BBGers’ hearts pumping and muscles working.” Users can expect to encounter such boot camp staples as burpees, ab bicycles, mountain climbers and, of course, medicine ball squats (ouch). Workouts are structured into 28-minute bursts comprised of two seven-minute workouts that are each repeated twice, which is enough to work several different muscle groups without being too strenuous, or worse, too boring.

Kayla Itsines

The app will set you back $19.99 per month — peanuts compared to your average gym membership, but maybe a little steep for users who plan on using Kayla’s workouts only to occasionally supplement existing regimens. But as a gym membership replacement for the home workout lovers out there, this app seems like quite the steal.

Whether or not the app is for you, one thing’s for sure: Kayla Itsines is THE digital trainer to watch right now. Our booties thank you, girlfriend.

Do you swear by #BBG? Tell us about your experience @britandco!

(Photo via @kayla_itsines)