Exercise can harm

Athletes beware - endurance training may make it more likely that you will need a pacemaker, scientists believe.

A British Heart Foundation team found exercise in mice triggers molecular changes in the part of the heart that generates its natural beating rhythm.

This may explain why elite athletes have low resting heart rates and a higher risk heart rhythm disturbances, they told Nature Communications.

However, the benefits of exercising still outweigh any risks, experts say.

Exercise 'messes with heart rhythm'  http://www.bbc.co.uk/news/health-27389257