Issues concerning the knee, hip and back are usually self inflicted and caused by long term neglect.
An overloaded amount of pressure on one single joint for an extended period of time can cause a chain reaction.
This chain reaction can cause a negative effect on unrelated joints.
These conditions are considered to be the ROOT CAUSE of the problem and cannot be healed by temporary masking tools like drugs, replacements and surgery.
The simple stretch that you're gonna learn today is one of the major solutions for addressing the root cause of your discomfort...which is key!