Depending on how the tradmill is built (which, of course, I would have no clue), yes. If the circuit isn't broken or diverted somewhere in there. That would certainly happen if you hooked two wires directly to the motor.
A multimeter might be a smarter option if you want to try.
One-handed deadmills. Hmmm - sounds like CrossFit to me. Gotta be part of a WOD somewhere.
-->Adam