Be Your Own Therapist.
Moderation is always the goal initially.
Speak with your doctor first if you have not been exercising regularly or if you have some physical difficulty that might preclude exercising. Dr. Morehouse recommends one minute of limbering and stretching. You can create your own limbering and stretching exercises, follow Dr. Morehouse's, or find another book with similar suggested exercises. Your aerobic exercises may also be different from Dr. Morehouse's, yet accomplish similar results. If Dr. Morehouse's book is unavailable, then I recommend reading others of the genre in your local library if you wish more detailed information about pulse rates, interval training, stretching, endurance, etc.