For educational use. No copyright infringement.
A great video that explains the need to consider ergonomics when designing for comfortable human use.
Ergonomics is a branch of anthropometrics that explores and measures the different sizes, shapes, strengths and other factors that groups of people typically exhibit so that we can design better products that are more 'user-friendly'.
Search 'Ergonomics' and 'Anthropometrics' online to discover more or click on this link: http://www.ergonomics4schools.com/