And transport them to the pituitary, where they're stored for later release
The correct answer is "exercise"
By meaning, reinforcement means to make something stronger. In the context of relationship it means strong and deep human relationships.
Thus, reinforcement is an exercise in the relationship.
This is known as a cross punch. This punch is normally made with the dominant hand of the boxer at the same time the opponent leads a punch with the opposite hand, it is known as the cross punch as it crosses over the leading hand, and is a powerful punch that takes little time to arrive at the target.