The unique M Series cardio line features Keiser’s innovative magnetic resistance system. Designed, engineered and manufactured in the U.S. to strict quality standards and test procedures, which guarantees an extremely durable and effective machine. You can also outfit Keiser M Series equipment with our intuitive M Series computer. Motivate and empower by accurately tracking and measuring: Workload (watts), Heart Rate (Polar™ compatible), Time, Distance and Cadence.