I don't know how to answer your specific question.
But the new Facebook settings are actually useful in this situation. Rather than creating a whole 'nother Facebook page, you could create a List of your training peeps. (Go to the page that shows all your friends, add one to a List that you create, then add the rest of them to the same List.)
Then make your posts concerning your training visible only to that list. (Click on the lock icon below your status update, then from the pulldown menu select "Customize" -> Make this visible to: "Specific people..." and enter the name of your List.)
Speed comes from what you put behind you. - Judi Ketteler