What´s ergonomics?... is the science of designing the job, equipment, and workplace to fit the worker.
Physical Ergonomics is concerned with human anatomy, and some of the anthropometric, physiological and biomechanical characteristics as they relate to physical activities.
Routine activities in your life:
-Domestic tasks-Carrying the backpack
-Keeping a good posture
-Sleeping
Anything else? [...]
Here, you can find the solution (notes):
http://docs.google.com/fileview?id=0BxDSxvk8an8VYjNkNjc1ZmYtOGIxNS00MTUxLTk1ZDQtMTIyY2VlZmM0ODM4&hl=es
