Holding a dumbbell at your chest with both hands, step your left foot out to the left side, coming into a lateral lunge and bending your left knee. Transfer the dumbbell into your right hand, and bring it toward your left foot while keeping your chest lifted — this will make the glutes engage more.
Push off with your left foot, and cross the left leg behind your right coming into a curtsy, bending both knees while bringing the dumbbell back to your chest. This completes one rep. Finish all your reps on this side before switching and stepping out to the right.