Improving ankle flexibility can be an important part of correcting flat feet. Specifically, the motion the often needs to improve is ankle dorsiflexion.
7 Great Calf Stretches For Tight Muscles - Foot Pain Explored
Library of Links & Exercises from Karen A. Langone DPM
10 Best Flat Feet Exercises Strengthening Fallen Arches — Feet&Feet
Stretch for flat feet - hero's pose exercise for flat feet and
How to Stretch Calf Muscles (and the BIG mistake to avoid
DorsiFLEX: Strong, Healthy Feet — for Life by Jim Cooper — Kickstarter
3 Exercises To Lift and Strengthen Your Arches (Flat Feet)
Guide to Fix Flat Feet - Fix Flat Feet
Can I get an arch in my flat feet? - Quora
The Ultimate Plantar Fasciitis Treatment Guide