Last year, the New York City–based spin studio Peloton Cycle broke away from the pack of spin boutiques by launching its own high-tech, at-home bike. The Peloton bike ($1,995 plus $40 a month for unlimited classes) is tricked out with an HD touch tablet that streams all of the studio’s classes to the bike, allowing owners around the world to participate in the array of classes from any Wi-Fi-equipped location.

This year, Peloton introduced a series of heart-pumping 20-minute rides that are accessible on the…