Self-examination is a good thing. Once we realize where we are, be it good or bad, it becomes a starting point for some action to be taken in the Lord. This type of attitude will help us to receive reproof, correction and rebuke so that we can yield the peaceable fruits of righteousness. Back to praise and worship, God's focus is on the state of the heart. People lift their hands.
People sing songs.
People play instruments. People shout, scream and dance. After all the dust of these happenings occur, the focus is still the same. The last question is the focal point of where this is going today. Therefore, the purest essence of praise and worship comes from the heart.