Step 1: Understanding the Concept:
Asanas are classified based on the starting body position: Standing, Sitting, Prone, or Supine.
- Prone: Lying on the stomach (face down).
- Supine: Lying on the back (face up).
Step 2: Detailed Explanation:
1. Bhujang-asana (Cobra Pose): The practitioner lies on their stomach and lifts the chest. It is a Prone pose.
2. Makar-asana (Crocodile Pose): A relaxation pose performed while lying on the stomach. It is a Prone pose.
3. Shalabhasana (Locust Pose): The practitioner lies on the stomach and lifts the legs. It is a Prone pose.
4. Supt-vajrasana (Supine Thunderbolt Pose): The practitioner first sits in Vajrasana and then leans back to lie on their back. ``Supta'' means reclining or supine.
Step 3: Final Answer:
Supt-vajrasana is a supine pose, not a prone pose.