Principle 6 LOW PHYSICAL EFFORT
The design can be used efficiently and comfortably, with minimal fatigue.
Universal products and places allow users to keep their bodies in natural, easy positions. They also limit long-term physical work, minimize strength requirements, and are NOT too hard to open or move. If appropriate, they use large (vs. small) muscles, work with gravity, and push or pull--ALL are less tiring than pulling or lifting with arms only.
Designer: Brian F. Donnelly, Donnelly Design, Davis, CA.
Designer: Terry C. Lee, U. S. Department of Agriculture Forest Service, Grants Pass, OR, for Rogue River National Forest.