How do I set up an ergonomic chair correctly?

Set up in this sequence: (1) Seat height — feet flat on the floor, thighs parallel to floor. (2) Seat depth — 2"–4" space between front seat edge and back of knees. (3) Lumbar height — support contacts the inward curve of the lower back. (4) Lumbar depth — gently firm, not pushing you forward. (5) Backrest angle — 100°–110° recline. (6) Tilt tension — moderate resistance when reclining. (7) Armrests — elbows at 90°, forearms parallel to desk. (8) Headrest — contacts base of skull without pushing head forward. OfficeFurniture2go.com provides an ergonomic setup guide with every chair order — call 1-800-460-0858.