Healthy Habit No 1 
People who seem to be always in good shape move a lot. This seems pretty basic, but in a sedentary society, we are moving less than ever before. So we often have to make an effort to move more both at work and at home.
Slim, fit people don't shy away from physical activity in their daily lives. They will walk if they can rather than drive and will take the stairs rather than use an elevator. They consciously go out of their way to find opportunities to move. Whether that is parking a greater distance away from the shopping mall, taking the stairs at work, or even picking up their pace when walking from meeting-to-meeting at work. They always seem to be on the move and moving fast at that.
They also find ways to be active in their leisure time and regard recreation activities as just part of an active lifestyle and not a replacement for a proper exercise program that will always contain strength building and maintaining exercise.
Whether they are involved in a sport, walking the dog, swimming, running, or stretching at their desks, they understand that staying in-shape is a lifestyle, not just a "kick" you go on. They will admit to exercise as something 'you become' rather than 'something you do'.