The biggest threat a fly fisherman might experience is Not going fishing. A three week break from the shore line and you are fucked. Morning might look like gold. Then, after 12 executive hours of pounding #7 in winter storm winds puts your body in a “used wet glove falling to the ground” state. Tomorrow aint really the day I need at this moment. The entire body hurts. Actually I need to get back on that horse and keep on fishing. Remember, never take a break from fly fishing.