How often do you see people "overarching" on the deadlift?

[zar9star]

Hey Mark,
my spine is naturally very arched. The chest up cue on the deadlift makes my back hurt for multiple weeks. In order to make my back flat, I feel like I need to flex it (mentally, on camera it still looks flat). That way I don't have pain. I feel like I am performing a crunch, however. Is it necessary to actively extend the back on the setup? Here is a video of what I think is too much extension.
YouTube
Those deadlifts hurt.

[Mark Rippetoe]

This looks like a normally underweight male lifter's low back in the deadlift start position. I don't know what you're doing to make it hurt, but I can't see anything weird in this video. Gain some weight and see what happens.

[zar9star]

This looks like a normally underweight male lifter's low back in the deadlift start position. I don't know what you're doing to make it hurt, but I can't see anything weird in this video. Gain some weight and see what happens.

Is 200 lbs at 5.9 considered underweight?

[Alchemist]

Rip, in an attempt to train my eye, should his shoulders be coming back more/chest up more, at lockout?

zar9star, why so many reps?

[Mark Rippetoe]

Never in a million years would I have guessed that the person in this video weighed 200. You may have a point here. If you are hyperlordotic, you will have to learn to use your abs more effectively when you start the bar off the floor.

[zar9star]

Rip, in an attempt to train my eye, should his shoulders be coming back more/chest up more, at lockout?

zar9star, why so many reps?

That was not a working set. It was for practice. Did not have enough patience for 2x5 so I did 10. In case you wonder why I have not posted a working set, I didn't do it, due to the pain.