As well as building strength in the legs, it improves balance and focus. Its challenging nature and the way it builds mental as well as physical strength, means it can help cultivate the confidence and inner strength needed to cope with responsibility. It is also said to help the yogi to align with his/her own personal power.
Traditionally, ardha utkatasana, like utkatasana, is associated with the muladhara (root) chakra. Working with this chakra is said to help increase feelings of security and stability. It can help the yogi to feel more in control and grounded. It is also said to be good for improving the power of the immune system.