question #2 Sahih al-Bukhari 6471, Book 81, Hadith 60 : How does the physical exertion in prayer reflect the Prophet’s (ﷺ) devotion and thankfulness to Allah?

The Prophet (ﷺ) used to pray so much that his feet used to become edematous or swollen, and when he
was asked as to why he prays so much, he would say, “Shall I not be a thankful slave (to Allah)?”