Nature's way to work out

"Few gym-goers would ever think of swapping their trainers, running shorts and T-shirts for wellies, a waterproof hat and Barbour. But there's a range of gyms where the latter is standard kit. In these fitness centres, sweaty cardio halls are swapped for open countryside, and exercise bikes and cross-trainers replaced with scythes. Welcome to the "green gym"." - Telegraph