Like any other musculoskeletal problem, plantar fascitis, is a result of an inability to absorb force. The end result is painful heel/foot.
The painful area is the symptom
or where the pain ended up, not necessarily where the problem started or the origin
. I have treated people who had plantar fascitis and the origin of their problem was in their quad, big toe, a shin muscle, and one in the hip flexor.
Re-Train the problem area to absorb force, and your symptoms should improve. This mean train the problem area to elongate eccentrically.
Chris Scarborough CSCS http://RunAFasterRace.com