Ayush Homa is a special pooja done to pray for a long and healthy life, and to pray that our body and all its organs remain in good health.
In Ayush Homa, we also ask for blessings so that our mind and intellect are healthy and in a positive state. The very meaning of the Gayatri Mantra is this:
May everyone’s intellect be illumined and inspired by the Divine. So it is done with this deep feeling that the Divine which is eternal resides within you, and you reside in the Divine. All yajnas are done with this feeling only.