So, there are a lot of exercises, such as deadlifts, in which both Kelly and Daniel tell us to keep a flat back. I have lordosis, hence the curvature of my lower back is really pronounced.

Yesterday I was doing some deadlifts and looked myself in the mirror to check my posture and saw that, even when trying to keep my back flat, there is some curvature in my lower back. So my question is: is that posture okay? Or should I try get a perfectly flat back, even though the curvature of my lumbar zone is greater than someone without lordosis?

Thanks in advance!