An example of an information processing system includes a training apparatus and an information processing apparatus. The information processing apparatus executes a game. The training apparatus includes a sensor and a processor. The sensor detects a load applied on the training apparatus. The processor transmits information relating to the load detected by the sensor as first information to the information processing apparatus while the game is executed. The processor stores information relating to the load detected by the sensor as second information in a storage device integral with or separate from the training apparatus while the game is not executed. The information processing apparatus progresses the game based on the first information received from the training apparatus, and gives a reward that has an influence on the progress of the game to a user of the game based on the second information obtained from the storage device.