Our editors were impressed with the Charge 2 and awarded it 4.5 stars out of 5 in our in-depth review. It even received the Tech Advisor Recommended badge of honour. The Charge 2 packs a number of features that are found in the more expensive Fitbit Versa and Ionic, but in a less bulky body.

Some useful features include Reminders to Move, interval training, Guided Breathing sessions and Cardio Fitness Level ratings. The only thing it doesn't have is a built-in GPS, but you can sync it to the GPS on your smartphone. Plus, you can change the straps.

Amazon has the Charge 2 available in a number of colours, though the black and blue versions are the only only ones seeing the £39 discount (the rest have discounts from £30 to £35).

Get the Fitbit Charge 2 with £39 off here.

We're always on the lookout for great Fitbit deals and list the best ones of the month in our dedicated article.

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