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This assessment test was originally developed by Dr. Vladimir Janda.
With hip extension there is an ideal firing order of muscles:
Opposite side Erector Spinae
Same side Erector Spinae
Variations in this firing order may be a factor in low back pain. If the glutes are not activating the muscles in the low back will be more involved in hip extension.
If the hip flexors are tight the glutes may be inhibited, so it is important to work first with stretching the hip flexors before activating the glutes.
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