Found a few:
Bullzeye - Sit on both seat bones equally
Slinky - Think of a slinky bending to the front, back, and side to side. Straighten up so the slinky is standing up on its own.
Level - Think of a carpenter's level, you want the bubble in the center. Level your hips.
Zipper - Wear a sweater with a zipper. Make sure the zipper is straight, so you straighten your body.
Gardening Knees - Bend your knees, move your lower legs back, push your knee cap down to the ground, and lengthen your leg.
Piano Hands - Make sure your thumbs are up.