The phrase "to bend over" is an idiomatic expression that means to submit or yield to someone's will, often in a humiliating or degrading manner. Full definition
Then they put me under church discipline for not bending over backwards to whatever she wanted. (redeeminggod.com)
The major chest exercise is the bench press and the barbell bent over row for the back. (fitnessdoctrine.com)
It's all right to hope against hope that your divorce will end in reconciliation, but don't bend over backward to make it happen. (collaborativefamilylawsandiegoblog.com)