FITBIT ACE 3

Kids rarely seem to sit still for longer than a nanosecond, so buying them an activity tracker might feel like a total waste of money - but if setting a step goal every day gets them out of your hair for a bit, it'll soon seem like the bargain of the year. 

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With a battery that'll last up to eight days between charges, Fitbit's Ace 3 also tracks active minutes, exercise time (its built-in activities include sprog-friendly stuff like trampolining and skipping) and sleep, so you might even be able to make bedtime easier by turn