My pharmacist encourages light exercise such as a half hour jog each day - however he has advised not to go overboard with muscle-building exercise, since (as everyone knows) muscle weighs more than fat, and although building muscle is not a bad thing, it can have a negative impact on your weekly losses and that can in turn bring down your motivation levels. I would say that light exercise is a good thing to do, but don't force yourself to do several hours a week if you don't feel the need to. Were you doing much exercise pre-LT? xx