It would be great to have time zone appropriate appointment calendar. Currently, we can only use the timezone of our location, but if a trainer has clients all over the world (which is the whole point of this app, I think) then appointments should be available in the time zone of the client. Currently, all clients can only indicate one location - that of a trainer - even if it isn't their location. It would be better if clients can indicate their own location and the app then adapts the booking calendar to their time zone.