Then you'd believe what the doctor said and would know that Batman prior to his Rocky-esque montage was not "just as effective."
Doctor: No, that's because there is NO cartilage in your knee, and not much of any use in your elbows or your shoulders. Between that and the scar tissue on your kidneys, the residual concussive damage to your brain tissue, and the general scarred-over quality of your body, I cannot recommend that you go heliskiing, Mr. Wayne
Does that sound like a man who's in good shape?