Halasana or Plow Pose is an asana

Asana

Asana is a body position, typically associated with the practice of Yoga, originally identified as a mastery of sitting still, with the spine as a conduit of biodynamic union...

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Etymology

The name comes from the Sanskrit words hala (हला) meaning "plow" and asana (आसन) meaning "posture" or "seat".

Description

The practitioner lies on the floor, lifts the legs, and then places them behind the head.

Cautions

This pose can put significant strain on the cervical spine, which does not normally undergo this type of stress, and can cause injury if not performed properly.

As alternatives, simply lying on the back and raising the legs into a hamstring

Hamstring

In human anatomy, the hamstring refers to any one of the three posterior thigh muscles, or to the tendons that make up the borders of the space behind the knee. In modern anatomical contexts, however, they usually refer to the posterior thigh muscles, or the tendons of the semitendinosus, the...

stretch, or doing a seated forward bend may be appropriate.