I agree be careful, my wife was prescribed orthotics when it turned out all she needed was her heels raised by foam inserts to take the strain off her achilles. Others sold orthotics and they have triggered worse problems than the initial injury.
Re my training group we have used barefoot work in a sand pit to strengthen the feet/ankles. One leg standing for balance + eyes shut with one leg raised. Small 2 footed jumps, med ball throws between partners, taken to a higher level stand on one leg and throw/catch between partners. It seems to help.