Never force a three-prong plug into a two-slot extension cord or remove the round grounding pin from a cord to get it to fit. If you have any cords that are missing the grounding pin, get rid of them.

If absolutely necessary, a three-prong grounded extension cord can be used, as long as it is short. The extension cord must also be heavy duty, which is to say, at least as thick as the treadmill ...

INCLUDES: 3 foot extension cord in White; ideal for extending power ... Plugs into any standard 3-prong power outlet; accepts 2- or 3-prong device plugs ...