The way I learned to cast was in my backyard, alone and wacking myself with the line till I figured it out. Give the kid a rod for a few hours and let him work it out. If he really wants to learn he will.
Steven

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"Just when I've caught a nice trout and feeling very proud of my fly fishing ability, my feet fly out from under me and there I sit, wet, flustered and properly humiliated by the Fly Fishing gods."
Jimmy Moore, "Taken Down a Notch or Two"