We spoke about the proper dress code, the proper things to wear on your feet, and the proper covering of your head. The next halakha (Jewish law) in preparation for tefillah (prayer) is the proper state of the body when you're preparing to pray. What do I mean? It says in Shulchan Aruch—and we'll keep this as clean as possible—that a person who needs the restroom is not allowed to pray. If he does pray, his tefillah is considered to'evah, which is a word for disgusting. It's not accepted; it's not proper. A person needs to pray again if he prayed while needing the restroom.
What does it mean, and what are the exact halachot? The opening of this topic is: Should one really be completely clean before praying, not have it on one's mind at all, not have any need at all? Fine, it's hard to do. We try to do that. If that cannot be done, then bedi'avad (after the fact), the person has to be in a position where he does not need the restroom and he can assess for the next hour and a fifth—in other words, the next 72 minutes. Shiur parsa, that's considered a long enough amount of time. That's considered to mean that his body is still clean. If it's less than that, what one does is something we'll have to deal with in the coming days.
But the basic halakha going into tefillah is that one of the most important things, besides your clothing and what you wear, is the body. Otherwise, if the body is not pure and clean, it's considered not a guf naki (clean body). That's not proper for tefillah; that's not the right thing to do. Again, overall, try to make sure that we do not need the bathroom in the next 72 minutes. If we end up using the bathroom right after tefillah, that doesn't retroactively ruin it. But if, going in, you know you're going to need it soon, that's considered a problem.