Stand near a counter with weight on your left leg. Take your right arm up to the ceiling, lifting your ribs and shoulders. Bring your elbow down out to the side at the same time and bring your right knee up to meet it.
Think about "a pinch" at your waist where your last rib comes down to meet your hip that's coming up, squeezing the side of your body.
If you want to work harder, grab a heavy can to add some resistance.
Reach and pull for a minute with your right side, and then turn and do the other side.