Dunno if this is true of the admin in question, but when I took my current admin position, the job description actually included a description of the level of physical exertion that could reasonably be expected to be part of the job description. (Basically, in order to do my job competently, you have to be able to lift a ream of 11x17 paper. You certainly don't have to be able to muck out a basement.)

I suspect this is part of the Americans With Disabilities act, to prevent employers from saying, "Oh, well, naturally we'd be more than willing to hire someone who uses a wheelchair, but what if we needed her to carry file boxes up to the attic?"