Hello. How do u know that u have displacement in back.?? If u have seen and orthopaedic  surgeon and diagnosed with spondylolisthesis then u need to keep a comstant follow up. Wear brace as advised and exercise as advised. Care of back and posture is very important. Weight reduction also is a must. Start with diet. Avoid sugar salt oil rice and junk as far as possible. Next exrcise or atlesst walk till ur pain allows. Hope u get better soon.