Subjects from both treatment and control group will be put on wristband starting from one week before the scheduled operation until 7 post-operative days. Patients will be instructed to wear the wristband continuously 24 hours per day except during water based activity. The treatment group will receive normal wristband with indicator showing steps count, distance, and calories. Meanwhile, the control group will receive Fitbit Zip with a display covered with adhesive tape and will not receive automatic feedback on the mobility from the device.