We're already big fans of Kayla Itsines's fitness app Sweat and the muscle-building, fat-blasting, and heart-pumping workouts it features. We love that some workouts are bodyweight-only, while others ...

We're big fans of HIIT, but we also know all that high-impact exercise can start to take its toll on your body: plyometrics, lifting heavy, and high-intensity cardio like sprints and intense cycling ...

Toning your glutes used to mean doing endless reps of squats, lunges, and kettlebells. But these days, there are plenty of other ways to sculpt your booty that don't involve navigating the weight room ...