What does "it" refer to and is it correct?

Hi~ in the final sentence, what do you think the word "it" refers to? And shouldn't "it" be changed to "they"?

To me, "it" seems to refer to the phrase "sequential actions", which is plural and doesn't make sense in grammar.

What do you think about this? Any idea would be welcomed.

Thank you~

The first element is to design the replacement behaviors in the form of
an action that is carried out in a sequential manner. An action completed
in a sequential order aids the learning process. The hippocampus, where
learning begins, is drawn to repetitive actions that follow a consistent
order. A good example of this is how soldiers and athletes train. They follow
a prescriptive training pattern in which they repeat a process over and
over in the same exact order, hoping that they will be able to perform the
action when under duress. Another advantage is that sequential actions
become valuable to the hippocampus, increasing the probability that it
will be held in the amygdala as well.