If this is the important habit - why is there no content here?
The top five exercise habits
The hardest thing about exercise is to start doing it. Once you have made exercise a sustainable habit and you are exercising regularly, you will find that the hardest thing will be to stop.
Measure your habit progress
If you aren't measuring your progress, how will you ever know when you've achieved your goals. One of the life habit principles is that you must measure how well you're doing, and take active steps based on your progress.