The world of optical heart rate monitors for athletes is growing fast – Fitbit has just taken the wraps off its new Surge, a ‘Fitness Super Watch’ which combines eight (count ‘em) sensors including GPS and optical HRM.

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Unveiled alongside the more affordable Charge (£99) and Charge HR (£119) models – which combine activity tracking, Caller ID and in the latter’s case an optical heart rate monitor – the Surge will cost £199 when it lands early next year.

Coming in three different colours (black, blue and our pick, tangerine), the Surge features built-in GPS to track pace, distance, elevation and more, and its smartwatch features include Caller ID, text alerts and mobile music control.

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