A friend made a valid point the other day. It seems obvious now, but consider this: When you fish a stillwater, there is a very good chance that for at least a portion of the day, you will stand there, or sit there in your float tube, and think about work, or some domestic trouble. Now think back to the last day you spent on a river or stream.  You scrambled up banks and slid down into the water, and waded over uneven rocks, and slipped and slithered , and hiked, and focused and cast and watched the dry fly