Best Gadget for tracking excercise Walking / Biking /Running

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Whats your gadget you like to use? I am looking for one to track everything biking / running / walking / swimming / heart rate possible
I have an Iphone and in the past used the Nike plus running shoes chip when and had some good success. I would like somethinking like an app or actual watch / device to track it all and add wirelessly to MFP or some where similair.

Thanks mucho,
Donna