Personal Trainer Certification - Free Study Aids
The following is a list of online resources that will help you study for your personal trainer certification exam. Some of the listed resources cover areas you will not need to know for the exam (such as the digestive system). These resources are not to be used in place of texts required by your certifying organization.

http://www.getbodysmart.com
An excellent site complete with tutorials and quizzes.

http://www.nsca-lift.org/videos/displayvideos.asp
Free online training videos from the NSCA.

http://www.exrx.net
A comprehensive resource for everything related to exercise science.

http://www.medtropolis.com/VBody.asp
Interactive software with narrations.

http://www.sci.sdsu.edu/movies/actin_myosin.html
An actin myosin crossbridge animation.

http://www.rad.washington.edu/atlas/
Muscle atlas provided by the University of Washington.