Heart rate zones are a way to describe how hard you're working during a cardio workout, like running or cycling. The faster ...

It absolutely can. For most people (excluding those who are aerobically fit enough to jog in zone 2), you can walk in a zone ...

A racing heart is usually a sign of agitation or excitement. But if it's not unusual for your heart to beat too fast or to skip a beat, it might be worth having it checked out by a doctor. In order to ...