Vrikshasana gets its name from the Sanskrit word vriksh which means a tree. As per its name, in this asana, you have to pose like the steady trunk of a tree. Unlike all the other asanas, Vrikshasana needs you to keep your eyes open so you can maintain your balance. When done regularly, it helps in strengthening your spine and leg muscles.
This article talks about the benefits of Vrikshasana and the correct way to practice it. It also discusses precautions that should be taken while practising this asana.