Instructors
In the beginning, instructor quality was very fluctuating. There were no courses available to qualify instructors, and because everybody can ride a bike, it was easy to locate instructors who wanted to teach but who did not possess the knowledge and skills needed to plan an optimal training session. Very often, aerobic instructors were placed in charge of the spinning sessions, and therefore, in the 1990s, participants were often asked to do press-ups or other aerobic-based exercises during the spinning sessions. Today, a variety of courses are available, ensuring that spinning is solely about fitness training (cardio) based on varying intervals.
If they don´t do it in the Tour De France, you should not do it on the indoor bike.. it´s a waste off time!