Physiotutors does a great job of explaining muscle tightness. This not only a good resource for clinicians but is a great video to send to patients that may not fully understand when you tell them that there hamstrings aren’t actually shortened and is a perception of tightness. Patients tend to love videos and visual learning.
Check put physiotutors website for more great videos: http://www.physiotutors.com/
photo credit: http://www.functionaleffect.com/blog-post-title-9/