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These are rubber wristbands that are being developed by Casio. Each wristband will contain an RFID chip filled with information of the said wearer. Step up to a workout machine and an attached PDA will read the RFID information and begin a personalized training session. Besides being able to control training sessions the wristbands can also check-in/out, track member activities, monitor kids' attendance, alert staff to emergencies and even act as a form of payment.

Translated Casio Press Release [Via Popgadget]