The fly fishing event at the GoPro Mountain Games has long been known as the 2 Fly X Stream for its final day of competition, when anglers would select two flies to use while fishing on the river. But ...

In theory, fly-fishing is a simple sport: Pick a body of water, choose a fly-fishing rod, select your “fly” (or bait), tie a secure knot, cast your line and, hopefully, land a fish on the other end.