An exercise game system of the present invention includes a plurality of game clients and a game server. The game clients transmit over a network, exercise intensity information in which exercise intensities of the players performing various types of exercises are measured. The game server drives an exercise game by receiving exercise intensity information of the respective players from the game clients over the network, and by determining a motion of a game object to be displayed on a game screen based on exercise intensity information that is balanced according to a predetermined balancing rule about at least one element of exercise intensity, a change rate, and a duration time according to different types of exercises. In this instance, the game screen is represented to be capable of recognizing the motion of the game object that is affected by adjusting the intensity of exercise performed by the players.