I think it depends a lot on the mode of transportation. An hour driving a car is really awful. An hour sitting in transit or a car someone else is driving is ok-ish because you can at least read a book or something. Though a lot of transit is standing room only which is again rather unpleasant. An hour of walking or cycling IMO is not bad if you have a desk job. Much more pleasant way to get exercise than going to a gym all the time, as many car commuters seem to do.