Of course, your doctor must also be aware of these things, and therefore I recommend that you choose your doctor carefully. Not all docs are informed about exercise hormone physiology, since there is no synthetic drug to prescribe for it. You must be certain that your heart can take it, and you must begin slowly and build up. I strongly recommend that you find a trainer to help get you started. Nevertheless, many body builders use it with every workout.
Creatine is cheaper and more effective.
It has a dramatic effect, even in the absence of exercise. Creatine is the substance in meat which causes muscle growth. A mere two grams daily is sufficient to do the job. It is odorless, tasteless, and mixes well with food, water or juice. Wait thirty days for the full result, or if you want quick results, use six grams per day for one week, then back off to two grams per day.