Disclosed is an exercise-data management system, which comprises a wristband 8 including an IC chip 7 recording therein unique information for authenticating a participant, a studio gate 3 set up in a studio and adapted to wirelessly receive and read the unique information recorded in the IC chip, and an exercise-data management server apparatus 4. The gelastic cushion is made from a conventional gelastic composition. The drive array controller may respond to a write transaction involving a particular row data stripe by calculating and storing row error correction data for the row data stripe before completing the write transaction.