Asher Yatzar is a blessing expressing gratitude for good health and awe at G-d’s creation of the human body.
The text reads: Blessed are You, Adonai, our God, King of the universe, who formed man with wisdom and created within him many openings and many hollow spaces. It is obvious and known before Your Seat of Honor that if even one of them would be opened, or if even one of them would be sealed, it would be impossible to survive and to stand before You even for one hour. Blessed are You, Adonai, who heals all flesh and does wondrous things.