The product is intended to be a tool for training racehorses. Able to determine the cardiac score of horses, the device is simple and practical: a sensor placed on the horse using a specific belt communicates with a telephone placed in the pocket of the rider or the driver, which telephone itself communicates with a server on which the data is deposited. The system is completed by a connected watch with a particularly refined display thanks to which rudimentary but valuable messages can be transmitted to the rider. The system is reliable in that even if communication with the server is lost, data is never lost.