Schober

You mark the L5 and place your thumb approximately 5 cm below this mark and your index finger aproximately 10 cm above this mark. Then, you ask John to touch his toes. Less than 5 cm increase in distance between your thumb and index finger, might suggest decreased mobility of the lower back. John can't even bend forward, it is too painful for him, and the pain shoots imediately into his R leg.

What do you want yo do next?