Sitting for a long period of time often leads to back pain, especially if the chair is not set up to your body. Choosing the proper office chair can help negate the common injuries associated with office work. When calibrating your office chair, it is important that deep seating still provides a gap of roughly four fingers from the back of the knee to the edge of the seat. The height of the chair should be adjusted so, your feet to touch the ground and your knees are bent around 70 Degrees while deep sitting. Arm rests should be adjusted to allow the shoulders to be level and muscles to be relaxed once the elbows are placed. Other features such as proper back support with lumbar cushioning and foot rests are also important in maintaining proper posture and overall back health.