A pronoun problem

a pronoun problem

The passage below comes from a book, Elite Sports And Vision By Ajay Kumar Bhootra.

https://books.google.co.kr/books?id=vTFSwYuEei8C&pg=PT29&dq=%22Today+in+a+highly+competitive+sporting+world+where+one+mistake%22&hl=en&sa=X&redir_esc=y#v=onepage&q=%22Today%20in%20a%20highly%20competitive%20sporting%20world%20where%20one%20mistake%22&f=false

Today in a highly competitive sporting world where one mistake or one slow reaction can ruin a sporting career, good vision is as important to sporting performance as good physical conditioning and consistent mental concentration. As physical conditioning has already proved its worth, visual conditioning will gain more and more converts. Many studies show that visual ability of the athletes are better than normal population. They are better at focus flexibility, and reveal greater depth perception or better eye-hand coordination, as well as many other excellent visual skills.

I'd like to ask a question regarding the underlined 'it'.
It seems to refer to 'visual conditioning'.
(Am I right?)

I'm posting this thread, since I cannot rule out the possibility of it referring to 'physical conditioning'.

Regards.