To clarify again: I am not saying that because I frequently take taxis and use the gym that I eschew walking - that is a false dichotomy.
I am only saying that I am willing to pay for this privilege of taxiing (over the MTR), and that my willingness to pay is measured against certain criteria.
I enjoy walking a lot - under certain circumstances. When I'm in a suit and tie, I only enjoy walking in climate controlled environments (inside buildings), elevated walkways (with cool breezes), etc. Being outside in HK during 25+ celcius weather in a suit and tie is quite tiring.
When I'm not dressed in a suit and tie, I tend to walk a lot. This debate really is a quality of life issue for me - paying for the right to allocate my walking time under different conditions (ie: suit and tie vs t-shirt and sweats).
Edit: I never said that walking is a waste of time - I just saw that someone somehow assume that from what I previous wrote; to clarify, I like walking.