So many people have some form of knee surgery and this pod is written to be used in the early days when the muscles at the tops of your legs are not easily connected to your brain.
Reduce your activity down to be aware of the effort you make, make it easier and easier.
This process can also be used by people who have back pain hip pain or curiousity to discover how to stimulate their central nervous system to be more in contact with their thigh muscles