I think I’d never seen so many stairs and elevators in my entire life before like in Hong Kong. They have public stairs and elevators like everywhere. This is what differs Singapore to Hong Kong since it is everywhere flat in Singapore so you don’t exactly need to climb to get somewhere.
Actually they might be good for your health when you have to walk them up and down everyday. Especially if you carry dozens of shopping bags with you while stairs-climbing. Can compare it to weight-lifting training in the gym. Good exercise :-)