From a staggered-stance position, turn both feet inward (pigeon toed).
Slowly, as if in water and trying to not make waves, move front knee forward (keep back heel on the ground) while reaching opposite hand up to the point where you just start to feel some tension (NOT as far as you think you can go!).
Then, without pausing or changing speed, move hips and hand backward, straightening front knee and bending back knee