Abstract: A communication system may include a server having a memory and processor, mobile wireless communications devices in communication with the server, a given mobile wireless communications device, and a given activity tracker device carried by a respective user of the given mobile wireless communications device. The given mobile wireless communications device may be configured to execute an online card game with other mobile wireless communications devices via the server, wirelessly communicate with the given activity tracker device for monitoring an athletic activity of the respective user of the given mobile wireless communications device, and communicate with the server and cause the online card game to deal a card when the respective user exceeds an athletic activity threshold.