I've often wondered how grueling forms of exercise affect our bodies, particularly our hearts. When I read this article from dailymail.uk.co I became even more convinced that moderation truly is the key to everything in life. So, if you're ready to embark on a strenuous exercise program, read this first by clicking here http://www.dailymail.co.uk/health/article-2262441/Exercise-Yes-CAN-fit-good-Why-exercise-harmful-heart.html