Stretch your client's psoas by pulling their knee posteriorly while having the side of your hip stabilizing your client's sacrum. Make sure your client is holding their other knee toward their chest to minimize the lumbar lordosis.
From a stretched position have your client try to flex their hip with only 10% of their strength for 10 seconds. Then have your client extend their hip further. You can gently assist with hip extension at the end of the stretch.
The hip flexion against resistance creates a post-isometric relaxation of the psoas muscle. The hip extension uses the antagonists of the psoas (gluteus maximus and hamstrings) and by reciprocal inhibition will cause the psoas to relax more.
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