Which step involves blocking and grabbing the subject's right arm with your left arm?

The first step of the arm drag drill is focused on creating control over the subject's arm, which is essential for successfully executing defensive tactics. By blocking and grabbing the subject's right arm with your left arm, you establish a crucial point of leverage. This initial movement is designed to redirect the subject's energy and position yourself to transition into further techniques or maneuvers.

In defensive tactics, gaining control over an opponent's limb allows an officer to dictate the encounter's flow, neutralizing potential aggression and setting the stage for more advanced techniques. The specific action of using the left arm to grab the right arm not only promotes distance management but also opens avenues for taking down or maneuvering the subject safely.

The other choices refer to different techniques or drills, which do not involve the same specific blocking action with the left arm against the right arm. The pummeling and cardiovascular training steps focus on other aspects of physical conditioning and engagement, emphasizing different principles that do not correlate directly with the mechanics of the arm drag drill’s initial step.