Wrenching is a better than the average trade, but you will accumulate damage in your hands and shoulders from it. The vibration of impact guns do considerable damage to your hands over a decade or two of work along with the tight squeezing of tools. Thick padded hand grips might be a good idea even if impact guns don't feel like it hurts right now. Heavy wrenching can do a number on shoulders too but shoulder sockets can be replaced, although it is supposedly not a pleasant experience.