[kangtangman]

Definitely not as tough as those goods and human carriers climbing up Chinese mountains.
Moreover most of the weight is borne by the rickshaw wheels, and the pullers only need to exert more force when going up small slopes.
Down slope will be aided by gravity.

Look if we gonna begin this comparison, there are many we can find in the world. This will be no end, just my opinion. 

For a young lady who look rather slim to pull the rickshaw for 6 hours every day and looking out for traffics that is both body and mind draining. And don’t get me wrong that those example you have posted here are not. Just my opinion.