Schober Test: how to measure lumbar mobility in flexion

When someone complains of "stiffness" or "limited mobility" in the lower back, it's easy to settle for a subjective assessment like "they struggle to touch their toes." The Schober test lets you go one step further and get an objective measurement in centimeters of how much the lumbar spine actually moves in flexion, separating that movement from the contribution of the hips or hamstrings.

It's a classic in physiotherapy and rheumatology (used for monitoring ankylosing spondylitis, among other things), but it's also very useful in a trainer's day-to-day work to get an objective measure of lumbar mobility.

What does this test measure?

The Schober test measures the increase in distance between two skin marks on the lower back when moving from standing to full trunk flexion. Since the marks are placed on the skin at lumbar level, the increase in that distance specifically reflects lumbar spine flexion, not hip flexion (which contributes the most in a normal "touch your toes" movement).

Equipment needed

• Flexible measuring tape
• Marker or skin pencil to mark the skin

Test protocol

1. The subject stands relaxed, barefoot
2. Locate the lumbosacral junction (L5-S1), which roughly corresponds to the line connecting the two posterior superior iliac spines
3. Mark that point on the skin (point 0)
4. Mark a second point 10 cm above point 0
5. Mark a third point 5 cm below point 0
6. Measure the total distance between the upper and lower marks in standing (it should be 15 cm)
7. Ask the subject to flex the trunk forward as far as possible, with knees extended, trying to touch the floor with their hands
8. Measure the distance between the two outer marks again in this maximum flexion position
9. Calculate the difference between the flexion measurement and the initial 15 cm — that's the Schober increment

Common mistakes

• Mismarking the L5-S1 reference point, which throws off all subsequent measurements
• Allowing the subject to bend their knees during trunk flexion
• Measuring with the tape loose or not held flush against the skin, inflating the measurement

How to interpret the result

Schober increment	Interpretation
≥ 5 cm	Normal lumbar mobility in flexion
3-5 cm	Reduced lumbar mobility — monitor and work on mobility
< 3 cm	Very limited lumbar mobility — if accompanied by prolonged morning stiffness and pain, consider referral for medical assessment (to rule out inflammatory pathology such as ankylosing spondylitis)

Important: a reduced Schober isn't a sign of pathology by itself. In people who train the lumbar area heavily with heavy loads (powerlifting, weightlifting), a certain amount of protective lumbar stiffness can even be desirable. Context always matters.

Relationship with other tests

The Schober test pairs well with other posterior chain flexibility tests:

• Sit and Reach Test — to differentiate whether the limitation comes from the lumbar region (Schober) or the hamstrings (Sit and Reach)
• Active Straight Leg Raise Test — complements the posterior chain assessment from another angle

Track and monitor

The Schober test is especially useful for longitudinal tracking: an increment of 4 cm today and 5.5 cm in 8 weeks is objective evidence of improvement, much more reliable than the subjective feeling of "I can reach further now." With Movalytics you can log the Schober increment in centimeters at each assessment and see how your client's lumbar mobility evolves over time, on a clear chart.

Frequently asked questions

Does the Schober test hurt? It shouldn't. If sharp pain occurs during flexion, stop the test and assess the cause before continuing. Does it detect herniated discs? Not directly. It measures range of motion, not quality or associated pain. For that, you'd need other specific neurological and provocation tests. Why use 10 cm above and 5 cm below instead of a symmetric measurement? That's the classic convention of the modified Schober test, designed to capture the area of greatest lumbar mobility while minimizing the influence of the pelvis and hips.