The natural warmup boulder traverse a foot above ground level, on the vertical face between Arena Arete and Chossy's Corner. It's on par with, or a hair harder than, Arena Arete. Move delicately between little flakes at various heights and angles, a good drill for face climbing.
Right side of Alapocas Main Wall at ground level. The only vertical, consistent section of wall there.
None needed, right off very level ground.