When doing curls, John is careful to extend through the full range of motion and quickly lock his elbows to make sure that he does not drop the weight. This is an example of __________.

Quickly locking the elbows at the end of a curl can put excessive stress on the joint and is not safe lifting technique. Moving through the full range of motion is generally appropriate, but it does not make abruptly locking a joint safe. Therefore, this is a bad technique because he quickly locks a joint.

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