There is if you're deluded enough to think it's going to burn any calories worth burning off. If you just enjoy being outside. That's fine. But it's not exercise. It's not even close. It doesn't even burn off half a Riveta.
LOL! And I bet they all eat 'low fat' yoghurt, do 'cleanses' and come back from their walks and down a Lucozade Sport, because they've done 'exercise'!
Listen to you're tongue woman! Nature didn't spend the last four billion years generating life and evolving sensory organs just to be over ruled by social myths created by advertisers and "advocates".