How can I correct lumber lordosis?

Some degree normal. Some degree of lumbar lordosis is normal. Excessive lumbar lordosis can be the result of anterior pelvic tilt which can be due to tight hamstrings. "lordosing" sports such as line in football and gymnastics can be associated with spondylolysis and spondylilithesis.
Strong abs. Llumbar lordosis is a good thing hyper lordosis can be corrected with stretching back and hamstrings strengthen core stand like a solider physical therapy can guide you to acstraightcerbalanced back.