The tight tendons is part of the problem...the need to stretch so as to avoid the chance of developing inflammation of tendons in the ankle, foot, etc, including the Achilles tendon. Its a bit ironic I have this, given that I ditched my shoes with high heels years ago for the very reason that they were cripplers, with the tendency to shorten the Achilles tendon and cause the very problem I now have...=(
Still a word of caution, people wearing shoes with high heels, you are inviting this sort of problem into your future, and let me tell you, its not fun. Its apparently an injury that occurs over time, so constant wear and tear on your tendons today is the Bleakfoot of tomorrow.