It is important to make sure you always have enough leg clearance when working at a desk or counter. Many people I evaluate have boxes, bags, garbage bins, etc. underneath their desks. When these items block leg clearance, people tend to twist in their chairs to avoid the obstructions. This results in awkward postures all through the body and can cause pain and discomfort. Also, not being able to stretch out your legs completely can result in cramping and leg fatigue due to lack of adequate blood supply. Move all obstructions and you will work with greater ease and comfort.