15-Minute Stairs Workout
To get blood flowing in your legs, climb the stairs slowly, keeping your shoulders back and looking straight ahead, then walk down. Repeat three more times. Next, run up the stairs, then walk down. On the descent, put most of your weight on your heels so that your glutes (rather than your knees) absorb the impact. Repeat three more times.
So maybe you can’t change your health overnight. But you can get a head start.