So last weekend I strained a tendon in my foot.  The pain existed from my outside ankle across my foot to my big toe.  Not quite all the way to the toe, but imagine a rubber band from your big toe to your outside ankle, and you get the idea.  It was only when I pulled on it that it hurt.  Since then I've been able to walk fine, with no pain.  yesterday I did a quick little vault over a bar, and a couple minutes later the pain returned.  So my question is this, what exercises can I focus on my feet first to rehabilitate, and second to strengthen to prevent this injury again?

Thanks for your help!
Tony