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The fitness keys are tracking devices that monitor movement and feed information back to an iPhone via Bluetooth.

The keys come in child or adult versions but, crucially, it ha€™s exclusive iPhone games that encourage you to keep fit and reach your goals, whether it's walking a long way or moving fast. Cute characters guide children and parents and the results can be shared via Facebook or a private group - like a mini social network - which you create for your charity walking target, for example.