Ahmed wrote:There is friction, obviously, but not really any noticeable power transmission ... Your wheelchair would be fixed with a piece of string that would easily cancel this weak training ...
A piece of string? In which subject ? Because its necessary diameter will depend on the weight of the person occupying the chair ... and the speed of the treadmill ... in short, your "piece of string" may quickly break ...
Mass and speed = friction and grip = power transmission
Then this remark shows that you have not read my example of the bicycle ... therefore go back a few messages!