Summary & Conclusion: During the practice of VK the VO2 and EE increased by 84%, 86% followed by 7%, 8% reduction in post phase respectively. The control session of supine rest showed continuous reduction. RR & HR increased significantly during VK & not in SR. Changes were more prominent in females than males. It can be concluded that yogasanas though practiced with relaxation, may increase muscular effort. Therefore these yogic postures can be used as an aerobic exercises followed by deep rest.