What are the best ways to increase range of motion in the ankle?

Active range of motion exercises like writing your name in the air with your feet helps with mobility. Also, standing at the edge of a step and letting alternate heels lower down helps with dorsiflexion range of motion. Once range of motion is restored I love utilizing the fitness band for strengthening the angle in all ranges including plantar flexion, dorsi flexion, inversion and eversion which helps greatly with ankle stability.