There are stretches of a Fargo winter when the honest answer is that the dog is not going for a proper walk today. Not a shortened one, not a brisker one — the wind across open valley ground removes the option entirely for a few hours or a few days at a time. Owners who plan around this do well. Owners who assume they will tough it out spend February watching a bored gundog dismantle something.
The substitution that actually works costs almost nothing, and it works because of what this breed is. A flushing spaniel's primary working organ is its nose, not its legs. Scattering a meal across a rug, hiding a scented item in a stack of boxes and asking the dog to find it, or building a simple indoor search circuit through a basement will tire a Welsh Springer far more thoroughly than an equivalent stretch of walking. Twenty minutes of concentrated searching does what an hour of trotting does, and it can be done in a hallway.
This is also where the breed's 4 out of 5 trainability earns its keep. A dog that learns quickly is a dog you can give a genuine job to indoors, and the equipment list is a few cardboard boxes and some patience. Budget nothing for it, and count it as the single most valuable Fargo-specific habit on this page.