Banners
Banners are a way to post a picture or announcement on the daily workout without notifying the members.
Best use for these might be:
Announce birthdays
Post community pictures
Pictures of the whiteboard's results
Announcements
Announcements notify the members on their mobile device that there was a post from the gym on the daily workout.
Best use for these might be:
A last minute class cancellation
Reminders
Quick need-to-knows about upcoming events or issues at the gym