http://productreviewssite.com/health-fitness/the-heart-rate-monitors-function/ Sun, 08 Nov 2009 11:47:24 +0000 http://backend.userland.com/rss092 en Sports are very popular and that is not a point that can be argued about. However, the main problem caused by sports or exercise is overworking of the heart and that can even eventually lead to heart failure. That does not have to happen, though, and the way to prevent ... http://productreviewssite.com/health-fitness/the-heart-rate-monitors-function/