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Foot-tapping is an absolute no-no in a professional orchestra, because it indicates that you are not following the conductor.

Sorry kenm, the tears are rolling down my face with laughter about this. Speaking as someone who freelances with orchestras, under many conductors, (some well-known others not so) I can safely say that not all conductors (even those well-known names!) keep time or a beat. In fact, it "BEATS" me

how any of them got the job in the first place!!
There are those who literally wave their arms around, like a giant windmill, without any rhythm or count at all, while some hardly move which is particularly bad if you're unlucky enough to be seated on a desk behind a tall player - it's difficult enough to see the conductor let alone his/her arms.
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When I am conducting I consider it shows poor training.

You wouldn't, if you'd ever been a player sat in an highly-ranked professional orchestra and nearly had a performance grind to a halt because of the moron on the podium. All professional orchestras know the repertoire inside out and also know which conductors to ignore - they will keep their own internal beat ticking over for these occasions. Ironic the conductor is always the first to receive the audiences appreciation though
So folks, next time you attend a professional concert spare a thought for the poor orchestra who may have been slogging it out under their own steam for the last two hours.