35 minutes of progressive intervals featuring sprint bursts from 150 to 180 beats per minute in a superset template. Keep Podrunner going with a contribution or purchase at https://www.podrunner.com/donate.html. Podrunner is a registered trademark of Podrunner LLC. Music copyright © or CC the respective artists. All other material c2013 by Podrunner LLC. For personal use only. All rights reserved. Any unauthorized reproduction, editing, exhibition, sale, rental, exchange, public performance, or broadcast of this audio is prohibited.