Literally meaning ‘with oxygen’, aerobic exercise strengthens your heart and lungs with the knock on effect of improving the way your body uses oxygen. It can also help to reduce stress and improve mental health as it causes the release of endorphins - chemicals that trigger a positive feeling and can act as a natural painkiller - in the brain. It’s often known as 'cardio' down the gym but can include anything from swimming and jogging to dancing and rowing.