Stairs, for exercise, are accessible just about anywhere. Stair walking count as cardio exercise. But they also strengthen and tone our lower body, particularly calves, thighs, abs, and glutes. And who doesn’t want toned glutes? Check out this link for more details.
Many of us either neglect stretching, or we do it wrong. Dynamic stretching (e.g., jumping jacks, etc.) should be done before exercise or physical activities to prepare the muscles. Static stretching (e.g., touching our toes, etc.) should be reserved for after exercise or physical activities. Do not skip the stretching. See details in the link below.