On an energetic level, our sense of grounding comes from the root chakra (muladhara), also known as the base chakra. When this energy centre is flowing freely we feel connected, secure and grounded. So adding a few yoga postures that work this chakra to your practice can reap the awesome benefits.
The 4 postures are - Easy Pose, Garland Pose, Pigeon Pose and Corpse Pose.