Hanuman was an incarnation of Shiva and Vishnu and was born to the Wind God (Vayu- वायु). Because of this, Hanuman is said to rule the Prana, vital life-force. Even though Hanuman had divine origins, he spent his entire life in devotion and service to Rama (the divine God-King of that time). He exemplifies the importance of key virtues like devotion and service in one’s life. When one whole-heartedly offers themselves in service to the Divine, then one is blessed with abilities to surpass any obstacles or challenges in life, including having perfect control of their very life force itself. Thus, is the greatness of Hanuman.
When we pray to any divine form, we not only seek their blessings, but we are also looking to modify ourselves, mould ourselves in their qualities and virtues. Because of this, when we pray to Hanuman, at an immediate level, we seek his blessings for relief from problematic situations. We seek and obtain his help to un-block our path to joy and success. By continuing to pray to him, over time, we start to inculcate divine qualities of self-less love, devotion and service- which then help us to lead life as our highest self; ensuring that we are always taken care of and protected by divine presence and grace.