Head Position

Why this matters

The head is heavy, so where it sits sets the tone for the whole upper body. What matters is the head's alignment with the trunk, not with the vertical: a runner with a healthy forward lean should carry the head in line with that leaning trunk — ear, shoulder and hip in a straight line. Measuring the head against vertical would wrongly flag a well-aligned head on a forward-leaning runner. As the head drifts ahead of the trunk line, the neck and upper-trap muscles work harder to hold it up — a small cost on every stride that adds up over a long run, and one that usually travels with a rounded upper back.

• In line (168°–180°) — ear, shoulder and hip roughly straight; relaxed and efficient.
• Slight forward head (158°–168°) — the head sits a little ahead of the trunk line; adds neck and upper-trap tension over distance.
• Forward head (<158°) — a jutting posture that loads the neck and often pairs with thoracic rounding.

What good looks like

Lateral view at midstance (the Posture tool's frame). The ear, shoulder and hip line up straight — the head is stacked over the trunk (which may itself be leaning forward), the neck is long, and the gaze is toward the horizon rather than the feet.

Common faults

• Forward head / chin poke — ear well ahead of the shoulder; watch for accompanying upper-back rounding.
• Looking down — dropping the gaze to the feet pulls the head forward.

Coaching cues

• "Eyes to the horizon" — the simplest fix for a forward head.
• "Tall neck, relaxed shoulders" — lengthens the back of the neck and drops the shoulders.
• Thoracic mobility + deep-neck-flexor work — for a habitual forward head tied to upper-back posture.

Related measurements

• Trunk Forward Lean — read head position in the context of the whole trunk line.