RECOVERY:
After exercising for a period of time, keep holding on handgrips and press "RECOVERY"
button. All function display will stop except "TIME" starts counting down from 00:60 to 00:00.
Screen will display your heart rate recovery status with the F1,F2....to F6. F1 is the best, F6
F6 is the worst. User may keep exercising to improve the heart rate recovery status.
(Press the RECOVERY button again to return the main display.)