Fitbit Charge 2
If you are serious about your training, you may want to invest in an activity tracker. Use the built-in heart rate monitor to keep track of your training progress.
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From OnBuy
Fitbit Charge 2 Wristband activity tracker OLED Wireless Black,Silver
£64.50
Robert Dyas
Fitbit Charge 2 - Teal
£85.99
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