A training module, training system, and methods of monitoring physical activity and making a training module are disclosed. The training module includes a compressible article having a polyhedral outer surface, a motion detector that detects compressive and rotational movement of the compressible article, a controller that determines a number of compressions and a number of rotations of the compressible article, and a signal transmitter that transmits data to a mobile electronic device. The controller is in electrical communication with the motion detector and the signal transmitter. The training system and methods generally include those that embody one or more of the inventive concepts disclosed herein. The training module can improve a user's agility, endurance, speed, reflexes, and sensitivity, provide real-time and historical feedback on performance, and improve safety during training in group activities indoors and outdoors, and on a variety of surfaces, that might otherwise involve one or more spherical objects.