Workers should not use the maximum range. The arrangement of work postures in this case is carried out within the normal range (concepts/principles of the economy of movement). Besides this arrangement can provide a comfortable working posture. For certain things workers must be able and flexible enough to regulate their bodies in order to obtain a work posture that is more flexible in moving. Workers should not sit or stand while working for long periods of time with their head neck chest or legs in a tilted working posture.