Hi Markmiller,

Certainly, you make a good point and a flat back is a common cause of sciatica and back pain and tight hamstrings.

...however, it is not the only reason...

In this case, from 3 years ago, the information given would seem to suggest an increase in lordosis which can also go with the hamstrings feeling tight because they are lengthened and the Wikipedia reference-linkfacet joints compression which can cause referred pain.

It is why I feel we have to be very careful in giving people things to do without an assessment on the internet. Sharing ideas and exercises are great which is why I like to come here but giving someone advice which is not the best for their situation is fraught with danger...

Thanks for the information though - i am sure it is quite useful for the right patients.