Hip Flexor animation and tightness

Hip Flexor animation and tightness
This is my first animation in maya explaining 1. Function 2. origin and insertion 3. common ways we use them 4. Assisting Muscles 5. How they get shortened 6. Problems that arise from shortening them Original article and pictures take http://www.youtube.com/watch?v=8HDiQ4uHGYk&feature=share site