10/03/2026
Is Your Middle Back Limiting Your Running Efficiency?
Runners often focus on mileage, pace and VO₂ max when trying to improve performance. But the way the body moves, particularly through the middle back, can quietly influence rhythm and efficiency more than many realise.
Most runners are used to thinking about training in terms of numbers. Weekly mileage, interval sessions and race pace tend to dominate the conversation. While these factors are important, they tell only part of the story. How the body moves while running is just as relevant, and one area that is often overlooked is the thoracic spine, commonly referred to as the middle back.
Working both as a sports therapist in clinic and a running coach observing athletes in the field, one pattern appears regularly when looking at running mechanics. Many runners show limited mobility through the thoracic spine.
The middle back plays a key role in coordinating movement between the upper and lower body. During running the pelvis rotates slightly with each stride while the upper torso rotates gently in the opposite direction. This interaction helps maintain balance and contributes to the rhythm that characterises efficient running. When this coordination works well it often goes unnoticed. Experienced runners tend to look relaxed and fluid, with a natural arm swing and steady timing through the body.
One reason restrictions can have an impact is that the thoracic spine does not have a large amount of movement available in the first place. Research examining normal spinal motion shows the thoracic region typically allows about 30 to 40 degrees of flexion, around 20 to 25 degrees of extension and roughly 30 to 35 degrees of rotation to each side across the region. Compared with joints such as the hips or shoulders these ranges are relatively small.
Because the available movement is modest, even a small loss of mobility can influence how the body organises movement. If thoracic motion is reduced through posture, prolonged sitting or reduced movement variability, the body still has to create rotation and postural adjustment during running. Instead of occurring through the middle back, the movement may shift elsewhere. The arms may swing more across the body, the shoulders can become tense, or the lower back may begin to absorb more rotational load.
Modern lifestyles can contribute to this pattern. Long hours spent sitting at desks, driving or looking down at phones often place the thoracic spine in sustained flexed positions. Over time this can reduce movement through the middle back and runners rarely consider how this might influence their running mechanics.
Video analysis often makes these patterns easier to see. A runner who feels relaxed while running may actually display a rigid torso, reduced trunk rotation or disrupted rhythm when viewed on screen. In contrast, experienced endurance athletes often demonstrate subtle but well timed thoracic movement that allows the upper and lower body to work together smoothly. The movement is small but it helps maintain coordination and efficiency.
Improving running performance is not always about increasing mileage or pushing harder in training. Sometimes it begins with understanding how the body moves and identifying mechanical restrictions that may quietly influence efficiency.
For runners curious about how they move, structured video analysis and running assessments can provide useful insight. Seeing how posture, rhythm and mobility interact during running can highlight small adjustments that may help improve comfort and efficiency over time.
