The Heart Knows

Heart beats. It's a potent symbol is so many areas of culture both in the past and present. It's also taken on particularly unique and changeable meaning in endurance sports. Is training with heart rate actually stopping us from improving? We consider some of what we know about the heart as it relates to training and question if we should be using at all. So listen to your heart, or maybe don't. It might be leading you to a dead end.