Bear Grylls presents Week 4 of his 40 day military fitness challenge to get Brits into shape

THE sun is shining and Bear Grylls is urging you to get outside and get fit.

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His Be Military Fit course is all about challenging yourself in the fresh air.

Over the last few weeks he’s been sharing a series of exclusive videos for Sun readers – and here he unveils the fourth, as part of a 40 day challenge.

He said: "It's accessible and achievable - let's do this!"

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