TreadGuard is a mobile app that helps users exercise safely on treadmills using facial recognition and AI detection. In order to prevent users from being overexercised or having any accidents, TreadGuard will stop the treadmill when absorbing over-tiredness on the user's face more than an average in 10 seconds. TreadGuard will also be able to stop the treadmill when not detecting the user to prevent a further accident if the user falls off the treadmill.