Why you need to work on your posture
When you keep a good posture, it does not only help your muscles to work properly, but also keep your blood circulation flowing throughout your body. Your facial muscles and skin are highly involved in this. They get a good supply of blood and oxygen and waste products are removed, leaving your face radiant and beautiful.
Again a bad posture can affect your mood and personality and make you look so unattractive to people. It can even make you look 60 when in the real sense you are just 30. A good posture will help to prevent premature aging of your facial skin, which eventually causes an uneven skin tone.
Further, Bad posture can cause muscle tightening (like your temporalis and masseter) and this can cause your face, especially your jaw to misalign. Also, the tightened muscles can cause your head to move forward, tilt and rotate creating a hunch in your middle back. When you keep a good posture, the tight jaw and facial muscles become loosened and this can create an alignment that properly positions your neck.