The Spirit Himself makes intercession for us[b] with groanings which cannot be uttered

Romans 8:26
Likewise the Spirit also helps in our weaknesses. For we do not know what we should pray for as we ought, but the Spirit Himself makes intercession for us[b] with groanings which cannot be uttered

The Holy Spirit does prayer Himself in us, this is the unutterable prayers that can be manifested outwardly in tongue. This is indeed a glorious occasion that God can use us as a praying vessel, praying for us when we don't know what to prayer. The other aspect of this is to remember that the Holy Spirit is living in our bodies which are regarded as the Temple of God. This is more reason for us to maintain purity in our bodies and not forget that our physical body is also called to be holy.