Range of Motion: Generally, the first type of exercise to do because it places a relatively low amount of stress on your joints. While sitting down, trace letters, numbers, or shapes in the air with the toe of your injured foot. Another exercise would be to place your injured foot flat on the floor, while seated, and gently move your knee back and forth.
Stretching: To improve flexibility and reduce tightness in your ankle, these exercises aim to stretch the muscles around the tendons. Start by sitting on the ground with your leg set flat straight in front you. Then, holding the ends of a towel in both hands, place the towel under the ball of your foot and gently pull toward you, stretching your calf. Keeping your knee straight, hold the position for 10-15 seconds. Stop the exercise if you begin to feel pain, you should feel a little bit of tension in your leg. Slowly work up to holding the stretch for 1 minute.
Balancing: Regaining your balance after an ankle sprain is important so as to prevent the risk of future injuries. Balance exercises should be done every day regardless, however, if you had issues with balance previous to your ankle injury, you should talk to your physical therapist first before starting these exercises. Use a kitchen counter to steady yourself first. Place your fingers lightly on the back of the counter and then slowly lift one leg. Hold for 10-15 seconds to start and gradually work your way up to 30 seconds. As your balance improves you can try this with your eyes closed. Make sure the counter or other object is nearby in case you become unsteady or feel like you may fall.
Strengthening: These exercises are designed to help build the muscle directly. Sit down with your leg against a stationary object and push against it, with the ball of your foot. Resistance bands can also be used to create tension and perform the same motions. As a reminder, whenever you do any sort of strength train, never use any more resistance or weight than you feel comfortable using.