1. Start in the seated position and put a resistance band around both feet in the middle
2. Pick up the affected leg slightly off the ground and make sure there’s enough tension on the band
3. Move your ankle inwards then roll it outwards.

I like to wear shoes or go barefoot because I feel like the band slips less than while wearing socks. It’s a little bit of a subtle motion but try to mainly use your ankle as you go inwards and outwards. You should feel it in the muscles on the outside of the lower leg when performed correctly.