Pre-game Stretching

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What is your opinion of how much stretching & warm-ups should be done by officials courtside (as opposed to in the officials' dressing room) prior to gametime? I will usually stretch prior to coming onto the court at the 15-minute mark and do some simple stretching while on the court to stay loose. But I've seen officials jogging from midcourt to baseline on the sideline as part of their warm-up routine. I think this prevents them from their main responsibility of observing the teams' warm-ups and generally looks poor. For purposes of this post, level = high school varsity.