I have heard that biofeedback is technique in which people are trained to improve their health by using signals from their own bodies. My husband has a heart problem. He must increase his heart rate. His doctor has told him to retire but he doesn't want to listen. Can be a biofeedback help my husband.
I have been reading some article about biofeedback. It enables people to obtain voluntary control over various physiological processes. I know that they have mentioned that they can influence on peoples heart rate. To increase or to decrease it. I am not professional and I don't know to explain how it works, but it is possible. Don't give up!