Dandasana ~ Staff Pose
Danda: Staff, central "Spine" of the body
Do not be fooled by how easy this pose looks, go ahead, try it out now, sit awhile. Feeling it yet? This pose is excellent for strengthening the back and improving posture, but requires fairly limber hamstrings. It is better to have a straight back and bent legs than vice-versa, so go ahead and soften those knees or prop your butt up with a pillow/block/coffee-table-book.
Happy Cinco de Mayo!