Websites that Demonstrate Exercises

Recently, a poster on Turnstep.com asked about websites that provide illustrations on how to perform exercises. Here are some links that were offered:

• ExRx.net: Provides video clips of how weight exercises are performed and also lists muscles targeted. Note: another poster indicated that while it's a valuable resource, the form demonstrated in the videos may require modification.
• MuscleandFitnessHers.com: need to read individual articles to find information.
• Sissel.com: has stability ball exercises focusing on strength, balance and core.