Paul “Batman” O’Brien is a personal trainer, elite athlete coach, and martial arts medalist who has spent 20+ years teaching science-based, old school, joint-friendly isometric training for busy people. He has written 400+ articles, created 32+ books and programs, and worked with 3,000+ clients. After an MS diagnosis, he used isometrics to get off a walking stick and return to competition for Ireland. Connect with Batman on Facebook. He also makes charity appearances in the Batsuit and folds origami.