Abstract: A training machine comprising a frame on which is mounted an element freely rotating about a horizontal axis, and an inertial flywheel coupled to said rotating element. A strap is tightened about the flywheel. The rotating element is mechanically coupled to said flywheel and a microprocessor is mounted on the frame to provide a control signal for the adjustable traction device. Said control signal corresponds to an adjustable and predefined simulated difficulty to be encountered. The microprocessor is designed to store the torques theoretically needed for several predefined simulated runs and, in response to a signal corresponding to the actual torque, to generate a second signal corresponding to the variation in the torque required to attain the torque theoretically needed for the corresponding simulated run, the second signal controlling the adjustable traction device.