I am an older student and avid yoga practitioner. I have always had some difficulty with standing balance poses (on one foot). I am tall (which does not help) and have bilateral pronated ankles (i.e. my feet roll in and flatten the arch when I bear weight on that foot). I have a slender build and small joints. Are there adjustments or exercises that I can do to compensate for this issue? I would like to strengthen and stabilize my ankle joints.