Hot and cold with ice and water in a bucket – 10 on, 10 off to reduce the swelling and after a workout or therapy. As for exercise, lots of stretching of both the achilles but also the whole leg, esp calf muscles. Specific exercise that work are leg raise from a flat floor, leg lowers (i.e. lower heel from level position) on a step, side to side (wiper blade) using a band, squats, jumps (when it get s a bit stronger, step up/down. I would avoid running or other high impact exercise for a while.