With flat shoes
Spine is fairly straight. Calf muscle is relaxed when feet are flat. Flat shoes help evenly distribute the body weight throughout the foot.
With High heels
Chest is pushed forward. The lower back is pushed forward, taking the hips and spine out of alignment. Excess pressure placed on knees. Heels mimic the way a person walks on a ramp, increasing the pressure on the balls of the feet through a downward force.
หากยืนนานๆ จะทำให้เกิดปฏิกิริยา
If you stand too long time will cause a reaction with the knee