Severe tightening of flexor hallucis longus tendon in foot?

Stretch: If the flexor tendon is too tight it will also cause cramping of the arch area. You need to stretch out your great toe by hyperextending it gradually (holding your big toe toward your face) also use some icy hot, etc. Make sure that you stretch this at least 2 times daily, and before and after exercise.Good support is also needed in the shoes.