What is the Asher Yatzar blessing?

Asher Yatzar ('Who formed man with wisdom') is recited after using the restroom. It praises God for the intricate design of the human body: 'who formed man with wisdom and created within him many openings and many cavities. It is revealed and known before Your throne of glory that if even one of them were to be ruptured or blocked, it would be impossible to survive and to stand before You.' This blessing teaches us to appreciate the miracle of our body's functioning, something we take for granted, and expresses gratitude for health at the most basic level.