Treadmill and computer?

I was thinking of buying a cheap foldaway treadmill, the type operated
with your feet (not the expensive motorised kind) and was wondering
what activities it's possible to do while on one of these? I would
really like to be able to use my computer while I walk on it, is it
possible to do a bit of mousing if not typing? or are those treadmills
too difficult to do much except watch TV? Any feedback of feasibility
would be appreciated :)

thank you


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