If you're getting numbness, that suggests nerve impingement/disruption, so not sure on the overuse idea, but i guess it's possible. might be getting some pronounced enough inflammation to compress a nerve, but that's a shot in the dark. are there any other movements or positions that cause the same feeling? any past injuries that resulted in numbness/tingling? how's your shoulder/arm flexibility/ROM? any pain or discomfort prior to the appearance of the numbness?
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