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!

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

• DVD - 45min