Couple of things to try.
Make sure the pump head is pushed down all the way on the valve. The head can lock onto the stem without it being fully inserted, but won't let the air in.
You can also try and not unscrew the valve all the way. Unscrew it to the end then turn it back a half turn or so.
Make sure you can push the valve in without using the pump. If the tire is empty of air you should be able to blow some air in it with your mouth.
Good luck and let us know what worked.
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The treadmill is NOT!
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