Real swing vs. practice swing

[teach]

Some quality Father's Day time hitting balls into a net with my son standing behind me. After a few swings, my son states, "Dad, your swing when you hit the ball is terribly OTT, and looks nothing like your practice swings (which were apparently o.k.). And this was into a net! I shudder to think how large the difference must be when I am actually on the course.

Suggestions as to how to deal with this "ballitis" disease would be appreciated. Thanks.

teach