I can't figure out how cutting wood faster is going to be less body movement and exertion . I do and have done a lot of different types of woodcutting, more felling and bucking up firewood then any, substantial ground work for a few small to medium tree services, clearing overgrown drainage ditches and fence rows, this and that. Unless i am using something less then my 025, the saws seem capable of a higher pace then I am in smallish wood. On ditch banks , especially when froze or wet , manuevers to and from trees is treacherous and the harder part of the work. Sawing through the tree is more like taking a brake. Quicker I get through, the sooner i am on the move and that is nothing like taking your escape route on flat ground. You don't want to be tuckered out trying to move to safety. Some times the saw gets tossed to save self.