Foot/arch and toe strength have a correlation with upright position of your spine. If it is strong, core muscles in the trunk are being activated so it maintains upright posture against gravity.
Key Concept in Posture Correction
Hip flexor (iliopsoas) muscles can get short with long time sitting and lack of stretching. In addition, weak hip muscles (Glutues medius and maximus) make lower back muscles inactive and slouched posture.
Thoracic spine and rib cage should be flexible to maintain good neck position. Stiff thoracic spine and inflexible ribcages make muscles in the trunk and around spine weak and develop forward head posture.
Protracted neck and rounded shoulder posture come together with slouched posture. So, it should be addressed with lower back lordosis, neck retraction and scapula retraction. Forward head posture results in posterior muscle tightness/stiffness with headache and anterior muscle group shortness.
If someone has mid-line myofascial restriction inside their body, it will keep pulling the spine forward and will make it difficult to maintain upright position. Once it is released with myofascial release technique, it will be much easier to make a good posture.
