Question about front and back lever

I know my body should be hollow in back lever and front lever but what about extending my legs, is it allowed to arch your lower back a little bit to extend the legs or should lower back be flat at all times ? Also same for back lever is it allowed to arch lower back thanks

No arching. Keep the lower back flat.

Its so hard to keep lower back flat when trying to extend your legs !!

By the way im more talking about extending the hips and lower the hips down to fully extend legs

Roy Bruinsma said:

Its so hard to keep lower back flat when trying to extend your legs !!

Yes, that's the point.