Hi, Luis! I'm not Cathe, but she's very busy completing the Hard Core production so I thought I'd offer a few suggestions. I've been an ACE-certified group fitness instructor for almost eight years.
#1:
Talk to the group fitness coordinators and personal training coordinators in the fitness clubs in your area, and see if you could find someone to mentor you in live classes, perhaps allowing you to lead portions of the class to get a feel for what live instruction is like.
#2:
Go online and see if you can find some live workshops coming to your area that teach you how to instruct and train. There are many, many workshop presenters out there, and it would be very helpful to you to connect with them. Just do a Google search with keywords like "fitness instructor training" or "personal trainer preparation" and I'm sure you'll get many hits.
#3:
Contact the colleges you are thinking about going to, and see if they have majors or minors in exercise science, kinesiology, sports conditioning, etc. These are very science-intensive courses of study, so make sure to work hard at all your high school science and math classes. Also make sure to study up on human behavior!
#4:
Check out the Turnstep website (
www.turnstep.com) and the Fit-Pro website (
www.fit-pro.com). These sites are specifically for fitness professionals and welcome inquiries from prospective fitness pros like you.
#5:
Check out the IDEA website (
www.ideafit.com). IDEA is a member organization for fitness professionals (instructors, trainers, coordinators, managers, etc.) and is really one of the great clearinghouses for information and professional development.
That oughtta get you started. You go, girl!
A-Jock