David Groscup has over 40 years of experience in High Intensity Weight Training. Certified as a High Intensity Trainer by the IART/Med-Ex Group, he has trained many people successfully using this protocol; and he has written several books on the subject (available at: http://www.amazon.com/author/davidgroscup). Read his blog on High Intensity Training at http://drhitshighintensitybodybuilding.blogspot.com/.