Check out this collection of free fitness articles featuring everything from business development to nutrition.

While many of these articles are geared towards the general public, you might get some nice ideas to create your own fitness handouts.

There are some goodies like the sample 'Health History': http://www.body-basics.com/trainers.html#history

View all of the articles below: http://www.body-basics.com/library.html

Here's another free fitness article library which features over 200 articles. Many are general and a bit basic, you can still find some goodies (again, it will give you plenty of ammo for fitness handouts):
http://www.atozfitness.com/cgi-bin/dclinks2/dclinks.cgi