Brock Armstrong presents a very interesting interview with Al Kavadlo who is an expert in body weight strength training and calisthenics. He has been featured in the\xa0New York Times\xa0as a regular contributor to\xa0BodyBuilding.com\xa0and\xa0Train Magazine. He is the author of four books, and he is also known for his appearance in the popular\xa0Convict Conditioning\xa0book series.