This move will challenge your balance and target your hip, glutes, and oblique muscles at the same time.
How to do it: Start standing "on guard" and shift your weight to your right leg, turning your right heel slightly forward and keeping your knee soft. Keep just your left toes lightly touching the ground and extend your left arm up to the ceiling (keeping your hand in a fist). Lift your left leg up to hip height as you pull your left elbow down towards your hip. Lower left leg down to the ground and extend left arm back up to the ceiling, maintaining your balance on your right leg. Repeat 20 times with the left leg, 20 times with the right.
Bonus tip: Think about 'shortening' your left side as you pull your elbow and leg together to strengthen the contraction of your oblique muscles.