Ideally have the transportees walk up the hill by themselves, summer sledding style. That way you are by some strange definition guaranteed to be net positive ;-)
I think you are on to something here. Make all elevators in hi-rises down-only and all stairwells up-only. Convert falling excess desk-jockey blubber into usable electricity while lowering rate of CV disease and generally improving fitness. Downside is probably a lot of BO that didn't exist before.
