Eliminating wasted motion is an essential element of Lean manufacturing.  Wasted motion is one of the seven (or eight, depending your school of thought) dealy wastes.  It refers to any unnecessary time and effort required to assemble a product.  Excessive twists or turns, uncomfortable reaches or pickups, and unnecessary walking all contribute to wasted motion and may put error inducing stress upon the operator.

In manufacturing processes small amounts of wasted motion can add up quickly over the course of an entire production run. This video from Assembly Services and Packaging illustrates how optimizing your production line can affect the bottom line.