Thoracic Mobility Test (Rotation)

The thoracic spine is, along with the ankle, one of the most underrated areas in a mobility assessment. Limited thoracic rotation forces the lower back or the shoulder to "compensate" in movements like hitting, throwing, or even simply turning to look behind you. The quadruped thoracic rotation test is a simple and highly visual way to measure it.

If you work with rotational sports (golf, padel, tennis, throwing) or with people who have recurring low back discomfort, this test should be on your radar.

What does this test measure?

It measures the active rotation range of the thoracic spine in a position that minimizes hip and lumbar spine involvement, isolating the thoracic segment as much as possible. It's quantified as the rotation angle of the trunk/elbow relative to the starting position, measured with a goniometer or inclinometer.

Limited thoracic rotation is associated with compensatory overload in the shoulder (in throwing or hitting movements) and in the lumbar spine (in trunk rotation movements).

Equipment needed

• Floor or mat
• Goniometer or inclinometer (can be replaced with a smartphone app with an inclination sensor)

Test protocol

1. The person gets into a quadruped position (hands and knees on the floor), with the spine in a neutral position
2. Ask them to place one hand behind their head (or neck), elbow pointing toward the floor, while maintaining support with the other hand and both knees
3. Ask them to rotate the trunk, bringing the elbow toward the ceiling, following the movement with their gaze
4. The hips and lower back should remain as stable as possible (some protocols place a stick along the spine to detect lumbar compensation)
5. Measure the rotation angle reached (elbow relative to starting position, or trunk relative to horizontal) with a goniometer/inclinometer
6. Repeat on the opposite side and compare

Common mistakes

• Allowing the hips to rotate along with the trunk, "gaining" degrees that aren't actually thoracic
• Not fixing the starting position properly, making it hard to compare measurements across sessions
• Measuring only one side (asymmetry is a very relevant finding in this test)
• Confusing thoracic mobility with shoulder mobility when the arm moves more than the trunk rotates

How to interpret the result

Thoracic rotation reached	Interpretation
50-60° or more	Good thoracic rotational mobility
35-50°	Functional mobility but with room for improvement, especially in rotational sports
< 35°	Relevant restriction — high risk of shoulder or lower back compensation during rotational movements
Asymmetry > 10° between sides	Imbalance worth addressing, common in unilateral sports (golf, tennis, padel, throwing)

Reference values vary somewhat depending on the exact protocol and measurement point (elbow vs. trunk), so the most important thing is to always use the same method so results can be compared across assessments.

Related tests

Thoracic mobility directly influences shoulder and lumbar spine performance:

• Apley Scratch Test — limited thoracic rotation can show up as a false shoulder restriction in this test
• Functional Mobility Test for Swimmers — thoracic rotation is key during the recovery phase of strokes like freestyle and backstroke

Log it and track progress

Thoracic mobility responds very well to specific work (quadruped mobilizations, foam rolling, "open book" exercises) and usually shows visible improvements within a few weeks of consistent work. With Movalytics you can log the rotation angle for each side at every assessment, detect asymmetries between the dominant and non-dominant side (very common in unilateral sports), and check whether the mobility work is paying off.

Frequently asked questions

Why does thoracic mobility matter if I don't have back pain? Because a stiff thoracic spine forces other areas (shoulder, lower back) to move more than they should to compensate, which over time can lead to overload in those areas, even if the original "problem" is in the mid back. Which sports benefit most from good thoracic rotation? Any sport involving rotation or striking movements: golf, tennis, padel, throwing, swimming (freestyle/backstroke), and combat sports with trunk rotations. How can thoracic rotation be improved? With active mobilizations in quadruped or seated positions (such as the test itself turned into an exercise), foam rolling work on the mid back, and "open book" mobility exercises in a side-lying position.