The walking distances isn't really an issue so long as they are given adequate time to actually walk, provided proper footwear and other tools for the job (cart

The walking distances isn't really an issue so long as they are given adequate time to actually walk, provided proper footwear and other tools for the job (carts, for instance, so that they carry less), and given proper breaks of proper length (actually able to sit for 10 minutes, for instance). People get used to this over time. Every move being tracked and being penalised for bathroom breaks is an issue, however.