Ergonomic checklist for chairs

True lumbar back support - maintains the natural curvature of the hollow of the back.

Waterfall edge - Relieves pressure on the blood vessels of the mid-tigh and prevents numb legs, cold feet, and varicose veins. The forward edge of the seat should slope gently downward, and should not press against your thigh.

Padding - Less in more. Too much padding makes getting in and out of your chair difficult and defeats the other ergonomic features.

Mobility - The chair should move effortlessly. Five-spoked bases make it safe.

Armrests - allow your chair rather then your upper back to support the weight of your arms while you work. Armrests are offered as an option on most office chairs. A well-designed armrest does not extend in front of the chair.

Depth - Too deep a chair can be a problem for a small person. When you’re sitting with your back well supported, then should be enough room for a closed fist between the edge of the chair and your knee.

Height - make sure the chair is just high enough so your thighs make a 90-degree angle with your lower legs while your feet make a 90-degree angle with the floor. Concider a footrest if the chair is too high.

Footrest - this is an acceptable compromise when you’re working at a high desk or on a chair that can’t be lowered. Supporting your feet helps restore the natural curve of your back. Never lat your feet dangle in the air. Since a footrest will limit your mobility, use a long one that permits healthy squirming.