The Side Plank Variation exercise works your rectus abdominis, obliques and transversus abdominis muscles.
Coming into side flank twist, put your right hand on the ground and your left foot in front of your right. You're gonna lean the weight into your left foot, set your right foot on the floor, and then your left foot will come on top. Take block and hands and reach out for the sky, bloom the hips up. Then you're gonna take the block curl underneath your right rib cage and reach behind and you come right back to the starting point. Exhale, pull your hips up and reach and then reach it back up toward the sky.