The correct sitting posture

You are actually the "standard" height that most office chairs are designed for. The fact that you’re still hunching and feeling neck strain suggests that the problem isn't the chair's height alone—it is likely the relationship between your chair, your desk, and your monitor.

If you are struggling, you are likely falling into the "Standard Desk Trap." Here is how to fix it.

1. The "Elbow First" Rule (The Fix for Hunching)

Most people adjust their chair so their feet touch the floor, then try to work. Do the opposite:

Step 1: Sit in your chair and adjust the height until your elbows are at a 90° to 100° angle when your hands are on the keyboard. Your forearms should be parallel to the desk.

Step 2: Look at your feet. At 5'9", if your desk is a standard 29–30 inches high, your feet might now be dangling or "perched" on your tiptoes.

The Fix: This is where the footrest becomes mandatory. Use a floor footrest to bring the floor up to your feet. This supports your lower back and stops you from sliding forward (slouching) to find stability.

1. The "Eye Level" Rule (The Fix for Neck Craning)
   If your back is tired and your neck hurts, your monitor is likely too low.

The Goal: The top 1/3 of your monitor screen should be at eye level.

The Problem: Most monitors on their default stands are about 3–4 inches too low for a 5'9" person. This forces you to "turtle" your neck downward.

The Fix: Use a monitor arm or even a stack of books to raise the screen. You should be able to look straight ahead without tilting your chin down.

1. Check Your Seat Depth
   If your chair seat is too deep, it hits the back of your knees, forcing you to sit on the edge of the chair. This means you aren't using the lumbar support, which is why your back feels tired.

The Test: Sit all the way back. You should have a 2–3 finger gap between the edge of the seat and the back of your knees.

The Fix: If you have a chair like the Boulies EP460(https://boulies.com/products/ep460) or Master Series, use the seat-slide lever to pull the seat cushion closer to the backrest.