Viparita Karani, a fully supported pose using a wall and sometimes a pile of blankets, can be any practice where one is upside down, including the asanas of shoulder stand (Sarvangasana), headstand (Sirsasana), or handstand (Adho Mukha Vrksasana).
In modern yoga as exercise, it is commonly a fully supported pose using a wall and sometimes a pile of blankets. Viparita Karani can be any practice where one is upside down. This can include the asanas of shoulder stand (Sarvangasana), headstand (Sirsasana), or handstand (Adho Mukha Vrksasana). 
