Stand on edge of stair with half of the foot on the stairs and heel hanging off. Raise up on toes and slowly lower down past neural.
https://www.youtube.com/watch?v=Ck-Zks9K9Hk
Stand on edge of stair with half of the foot on the stairs and heel hanging off. Raise up on toes and slowly lower down past neural.
https://www.youtube.com/watch?v=Ck-Zks9K9Hk