From my own experience I can say that a bad back makes you hike slower, stove-up knees keep you from wading confidently, tendinitis of the elbows buggers your casting, and a dose of giardia can send you dashing to the bushes fifteen times in an afternoon, but although none of this is fun, it's discernibly better than not fishing.
John GierachIf we carry purism to it's logical conclusion, to do it right {fishing} you'd have to live naked in a cave, hit your trout on the head with rocks, and eat them raw. But, so as not to violate another essential element of the fly-fishing tradition, the rocks would have to be quarried in England and cost $300 each.
John Gierach