Why does wifi not work when treadmill is turned on?

Wi-Fi may not work when a treadmill is turned on due to electromagnetic interference generated by the treadmill's motor. This interference can disrupt the signals transmitted by the Wi-Fi router, especially if the treadmill is using a poorly shielded power supply. Additionally, if the treadmill is on the same circuit as the router, fluctuations in power can further impact Wi-Fi performance.