Should We Max Our Heart Rate During Exercise?

Heart health benefits from moderate to intense aerobic fitness, but there can be a side effect

Pushing yourself during exercise can literally make your heart bigger. StockSnap/Pixabay

You have your running shoes on, your Fitbit is charged, but now what?

When you exercise, your heart and breathing rates increase, delivering greater quantities of oxygen from the lungs to the blood, then to exercising muscles.