Gait analysis will be performed using the Tekscan walkway system. Subjects will be required to walk on a mat at their comfort speed and the process might be video-recorded for future analyzing the quality of subjects' movement (face will not be captured and consent will be obtained in advance). Gait parameters including step and stride parameters, symmetry scores, velocity, and cadence temporal will be collected and recorded while the subject is walk along the walkway. The whole procedure will last up to 30 minutes.