The Royal Parks Half Marathon is only a month away, with thousands of runners set to pound through 21.1km on closed roads in central London on 8th October. To celebrate the event, Fitbit is offering fabulous prizes to anyone who increases their activity in the weeks leading up to the event.

If you log 13 miles – or about a half marathon’s worth – of activity (around 26,000 steps) during any of the remaining four weeks before the Royal Parks Half you’ll be entered into the prize draw, with said prizes changing each week. If you’re thinking 26,000 steps in seven days doesn’t sound very difficult, you’re right, but Fitbit will reward you for being more active: every time you finish a virtual half marathon, you get entered into the draw, so each week you can increase your chances of winning a prize by passing 26,000 steps multiple times.

You don’t have to be running the Royal Parks Half itself to take part in the Fitbit competition. Although, of course, if you are running any half marathon in early October you should have a big advantage because you’ll be pounding the pavements regularly in preparation for race day, right?

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In week one the prizes are four Fitbit Charge 2 fitness trackers and a £100 Adidas gift voucher. In week two you can win one of four Fitbit Blaze trackers or a three-month PureGym membership, while week three’s prizes are four Fitbit Alta HR trackers and a £100 Lululemon gift voucher.

The Charge 2, Blaze and Alta HR are all cracking trackers, but in week four the big one is up for grabs. One lucky winner will go away with Fitbit’s new smartwatch – the Fitbit Ionic. The other prizes are two three-month PureGym membership and two Argos kettlebell sets.

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To get involved in the competition you can either register with an existing Fitbit device, or if you don’t have one, just download the Fitbit app to your smartphone. Then go to fitbitvirtualhalf.com to sign up. The challenge runs from 11th September to 8th October – how many half marathons can you clock up in that time?