The Cycling-Inform Store

In order to become a stronger cyclist, you need to overload your system and break it down. Overload followed by rest and proper nutrition allows your muscle to rebuild and become stronger. In Spinervals 4.0 - Muscle Breakdown, you will experience a level of training intensity that does just that breaks the muscle down! Video Preview. A variety of effective interval sets in this 45 minute workout add up to one of the best indoor cycling workouts ever produced! Length: 45 minutes Difficult level: 8.5