I grew up in a legalistic church that had rules on how you prayed. You could pray silently. You could pray out loud. But it should always be with eyes scrunched tightly, no one looking around and on your knees. If you weren't on your knees, God wasn't listening. Now I know God doesn't have rules on how you approach him, it was just that my church did.
Within church circles, we have people we refer to as "prayer warriors." They are people whom we know that has ability to go to God and faithfully pray. And they will PRAY sisters! If you have attended churches for very long, there is undoubtedly some saint that you know without a doubt is a prayer warrior. These are not people who pray "God bless sister Mary. She has a cold. God bless Pastor, Lord. And while you're at it, go ahead and bless his wife Lord, cuz you know married to him, she needs another dose of grace (Sorry Jason, just had to add it.)
I have heard the prayers of a warrior before and I have been astounded. When these warriors pray, their prayers do not rise up to heaven. No my friends, Heaven comes down to the Warrior. I have heard prayers that gave me goosebumps and you KNEW you were in the presence of something real, and something powerful. You are probably picturing someone right now. You know they are a warrior, even if you personally have never heard them pray out loud.
There is a couple in our church, that I know they are both prayer warriors. They do not shout their prayers. They do not seem to be extraordinary at all. But when they pray....things happen. Relationships get mended, situations change and the church body grows.