This is a gentle exercise to start with using a rehab or rubber resistance band. It is more suitable in the very early stages of rehab as long as pain allows. Hold a loop of resistance band and use it to apply resistance as you point the foot away or plantarfex the foot. Start with just 2 sets of 10 once a day and build up to 3 sets of 20 twice a day. If it does not hurt the next day then increase the resistance by shortening the section of band. If there is any pain during, after or the next day then reduce the load or rest a bit longer.