Assuming your upper body (shoulder alignment to ears) is ok, then your lordosis is caused most likely by (what people have already said) tight hip flexors, tight lower back, weak glutes. Try putting your feet up on a ball/chair while lying on the floor...that should help stretch out the lower back.
I'd have to go through his material again...but I believe Chek would say it also is caused by weak lower abdominal strength and lack of TVA activation.
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