[Mrblister]

First off are you going to need the whole person?, if so try this. 1. Get your camera set shoot the treadmill first without subject and create a seperate mask layer just for the treadmill. Here is the key you can light the treadmill different for a different kind of key. Maybe a Luma key. You could also try blue tape which is available at the hardware store to mask it off and shoot it. Let us know if you pull it off.