Lack of flexibility and stiff joints are the product of neglect. They always involve accumulation of excess waste in the tissues, and an acidic, toxic body terrain.
Solution to this condition of premature aging include changes in dietary habits, digestion, bowel issues, liver function, water consumption and systemic, low-grade inflammation related to the Autoimmune Attack Cycle.
Restoration of flexibility is not particularly difficult to achieve if a person is cooperative and can exercise some patience.
Stiff joints and sore tissues are old age in the making and should not be allowed to develop or progress.
This protocol varies according to the individual.
Ask for guidance.