When you do a task as a ritual, it has a small shelf life. It fades away after a while. When you join a fitness regime for a regular workout, it is mainly taken as a ritual. Hence within a short period, it loses novelty. And you are back to your old sedentary lifestyle.
On the contrary, when you take a task as your responsibility, it continues perpetually. This include your tasks as head of family, as a parent, as a spouse, as a professional and so on. Hence, for health and wellbeing activity to sustain forever, it has to be taken as a RESPONSIBILITY. Once you have adopted this approach, you will enjoy the fruits of good health.