Bob McGuire is a staff writer for <a href="http://www.rowing-machine-1.com/" title="http://www.rowing-machine-1.com/" target="_blank">http://www.rowing-machine-1.com/</a> and <a href="http://www.heart--disease.org/" title="http://www.heart--disease.org/" target="_blank">http://www.heart--disease.org/</a>