Cross Body Knees
To do Cross Body Knees, start standing then shift your weight onto one side as you reach the other leg out to the side just touching your toe down. You can turn the toe of your standing leg slightly open as you reach your hands up and toward the ceiling beyond your shoulder. You are reaching toward the opposite side of the leg that is out.
Then rotate and tuck your elbows toward your knee as you drive your knee up and across your body. You want to move quickly, rotating toward your knee and crunching then quickly reaching back up and out as you reach the foot back out to tap down.
Move quickly with the knees, keeping your weight on that standing leg so you even really feel that glute working.