For the walker I found this:
http://sketchup.google.com/3dwarehouse/detail...74d1a50d9&prevstart=0
http://sketchup.google.com/3dwarehouse/detail...6112727de&prevstart=0
For the rower I'm not sure if you mean a gym machine like these ones:
http://sketchup.google.com/3dwarehouse/detail...a9c9f20bf&prevstart=0
http://sketchup.google.com/3dwarehouse/detail...b4c7681f6&prevstart=0
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If a long walk every day were healthy, mailmen would be immortal.
