You don't have to have had a hip replacement or a knee replacement on one side for this to be a valuable lesson! For some, a strain or injury is the issue. For others, the gradual decline of aging has affected foot mobility.
After 25 years of helping people regain function with musculoskeletal pain, I can attest to the fact that everyone looses mobility in the lower legs and feet over time, even if active. After 45 or so, this leads to compression of the venous supply which impairs circulation. Most people are unaware that it's not just the heart that is responsible for circulation: the muscles in their contraction and extension are a vitally important part of the circulatory system. Without that supply of oxygen to all the tissues, every aspect of living is compromised: immunity, vitality, and the sense of aliveness, not just mobility.
Additionally, for those who have had a major surgery or injury, there is a deadening of sensation because the area associated with pain has been mentally disassociated from the self. This lesson can restore vitality in the limb by reawakening the sensation of pleasure that has been replaced with splinting and avoidance. You will not really notice that the area is not as alive as it could be until you actually regain the sensory awareness of it that is next level. You have to do the lesson to really experience and comprehend what it's like to regain that sense of connection.
This is an Awareness Through Movement (ATM) lesson to bring your body back online for optimal function. Give yourself an hour undisturbed in a place that is comfortably warm and has a mat on the floor that you can use. Somthing like a thik yoga mat or quilt: soft enough for comfort, but hard enough that you can sense your contact very distinctly on the ground.
It leaves you feeling younger, more stable and more dynamically mobile at the same time!