Standing between heaven and earth? If I did it my Sensei would stop me immediately. He wants both arms streight in front of me, not on the side.
Its at this point that it would be good to see this in video at youtube.
(With each instructor telling why they do this.)
The next step would be to try both methods, after watching, for oneself to 'feel' the difference and see if what is being said is really working. (If so then you have two alternatives. Or in some cases you may be able to streamline two techniques into one.)
This is what is so cool about coming here...its diverse in how we practice and you can enrich your own Aikido by learning through others.