Hey Steve,
An excellent question! Keep in mind that these are all school-aged kids and they get lectured 6-hours per day, 5-days per week---they quite possibly get lectured even more by mom and dad the second they get home. Point being, if you want to make it memorable, make it fun by making it less of a lecture, and more of a movement-based session.
My second suggestion would be to break them off into groups according to pre-, and mid-late adolescent girls. 5-11, 12-18--would be an example. Organize each topic and present it to the entire group by explaining the next task, then split off into your age groups to proceed.
**If you split the groups, place them back to back. All attention will be lost if you are trying to speak to a group of pre-adolescent females while the older group is directly behind you.
**Having the older girls as assistants is fine but, some of the girls may be a clueless as the pre-ads about what is going on, or they may not want to assist at all and you won't get much out of them.
**Talking about nutrition is important, however, you will be entering a very grey area. These kids don't buy the groceries for the house, have poor food choices at school, and probably won't specifically utilize any bit of nutritional information you give them. They all fall under mom and dad's rule and going too far against what mom and dad think could turn parents off from getting involved with you in the future. I realize that is a bit extreme, but not unlikely. 3 years ago I gave a presentation and talked about the importance of consuming water on a daily basis. Needless to say, I got a nasty phone call from a parent that said I was an idiot because water doesn't have any nutritional value and that her daughter is only allowed to drink juice and milk. Seriously...
Lastly, have one final activity that they can all do as a group. It can be as simple as a game of tag, obstacle course, or a warm-down activity.
Steve, I realize a lot of this is rather vague so the biggest piece of advice I can give you when dealing with this group is to act on their level. They are female kids...it's alright to goof around, have fun, etc. Those kids will unfortunately remember the experience based on how much fun they had, not how much they learned.
Have a good one, Steve.
Will Haskell
Athletic Development Specialist
www.athleterevolution.com
www.willhaskell.blogspot.com
www.athleticosportsperformance .com