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 a. a good technique because he moves quickly b. a bad technique because he moves through the range of motion c. a good technique because he is paying attention to form d. a bad technique because he quickly locks a joint select the best answer from the choices provided. a b c d

The correct option to fill the blank will be the option "D". Bad technique because he quickly locks a joint.

Explanation:

Doing curls using all range of motion can damage the muscles of the arm and can increase the risk of muscle injuries. It is always recommended to extend the forearm and form a 90° angle with the arm.

D. a bad technique because he quickly locks a joint

Explanation:

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 .  D. a bad technique because he quickly locks a joint