interesting read about heart regeneration and exercise:
http://news.yahoo.com/s/ap/20070905/ap_on_he_me/heart_exercises_1;_ylt=Aq4OMZgDeLFjyv2LSdainL9a24cA
http://news.yahoo.com/s/ap/20070905/ap_on_he_me/heart_exercises_1;_ylt=Aq4OMZgDeLFjyv2LSdainL9a24cA