To start make sure that you keep those heels loaded and your implement ( a kettlebell here) variable with those hips. You’ll push it out as the hips drop in order to keep balance. Shift over to one side and stack your hip right onto of your heel while shooting your opposite foot out straight. Its ok for the toes of the straight leg to come up. Push the ground away until you return to neutral and repeat the stacking on the other side.
This movement is designed to get all the saddle muscles. The things we don’t think about but may question if our knees start to bug us. Keeping this movement close at hand is key to not only having strong legs but healthy connective tissue as well.