On the subject of attitudes for prayer… this does not answer the question, but makes a very sensible peripheral point, and should also raise a smile or two..

“The proper way for a man to pray,” Said Deacon Lemuel Keys. “The only proper attitude Is down upon your knees.”

“No, I should say, the way to pray,” Said Reverend Dr Wise, “Is standing straight with outstretched arms And rapturous up-turned eyes.”

“It seems to me his hands should be Devoutly clasped in front, With both thumbs pointing toward the ground,” Said Reverend Dr. Blunt.

“Last year I fell in Hopkin’s well, Head first,” said Cyrus Brown. “With both my heels a stickin’ up, And my head a pointin’ down.”

“And I made a prayer right then and there, Best prayer I ever said, The prayin’est I ever prayed, Was standin’ on my head.”

[ source unknown to me, URL http://graceland.gentle.org/bag/prayatt.html ]