B K S Iyengar states - “I consider Shavasana (corpse pose) as the most difficult pose”. Shavasana is about relaxation, but tension prevents us from relaxing our body and mind. True relaxation means a complete resignation of the body to the laws of gravity, the mind to nature.
Whenever physical or mental fatigue is experienced, or the mind is agitated, the practice of Shavasana is recommended. The complete relaxation of the voluntary muscles at once transfers the energy to the involuntary parts. This transfer of energy produces the necessary balance for the renewal of strength. This posture is normally done towards the end of a 30 minutes physical practice to rest the muscles that got stretched.
Limitations: Avoid in cases of extreme depression.