Check out these three videos. Definitely concentrate on the posterior tibialis referenced in the third video. That muscle has a significant role in the arch of the foot. Also, I would recommend trying to mobilize your feet/calves for 10-15 mintues prior to any running or double under work. Also concentrate on the same areas for 10 minutes right after any running activities.  Concentrate on those areas and good luck with your running.

Take care,

Danny

MWOD Team Member