Plank uses gravity in a crafty way to insist we integrate our extremities as part our core.

Tadasana is purported to be the foundation for all other standing postures.

Bujangasana exemplifies the effort of the upper back in back bending.

Cat/Cow has just as much potential to form core strength and build mind-body awareness as any other pose you perform.

Setu Bandha Sarvangasana is the foundation for all the supine backbends that lift the spine up and out of gravity.