"Lately I have become somewhat addicted to Spinning Classes. Attending three to four times a week with various instructors for variety. There are the usual hill climbs, in and out of the saddle, jumps up and down from the saddle (one instructor favors 100 jumps), sprints on the flats (low resistance) I know as a roadie there is no substitute for the road but what are the advantages and disadvantages of Spin Classes as training for the road? ..." Read More ...