I don't know how to answer this question except to say that I know the class has helped my endurance, cardio workout. I am just starting out and took a cycling/yoga class for 6 weeks..once a week. I'm now in a cycling/spinning class for 45 min once a week. My first class was this past Tuesday...was rough, but fun!! LOL I got sick/dizzy about 3/4 of the way through, but I kept going. I think it too is helping my technique of pedaling with clipless and my leg strength.