yes, especially if those grinding stations don't have to reverse the direction of rotation to switch gears (I think the first few generations did switch direction to change gears like a standard winch) - which would make the bicycle style inefficient (I don't think I can pedal backwards nearly as effectively)

But if they're just using them to drive a hydraulic pump, use the legs man!

Of course, the drawback is that they might not have the strength to jump up and run across the trampoline quite as quickly as they do with the standing grinder stations...