You would not believe the upper body strength some of them have. When I was working at one of the hotels we hired a wheelchair bound ex-cop (he was shot in the back on the job) as a consultant for an accessibility study/plan for meeting new codes. What this guy could lift was amazing and how he could maneuver with just his hands and arms was something else. Anyone that wasn't always in a wheelchair wouldn't have stood a chance against him moving one around.