Hallelujah - I cannot stop singing to the Lord
Play a game of tag, and ask everyone to sing a song together while they are playing. Sing a Chistian song that everyone knows. One of the children is the tagger. If you’ve been tagged, then you have to stop singing and stand still. If one of the other 'free' children tags you free, you shout 'Hallelujah' and you start singing again.
Depending on the group you can explain the meaning of 'Hallelujah' before or after the game. Hallelujah means: I have to sing to the Lord. It's like I cannot stop!
Read Psalm 150 together with the children. Do you think that the author of Psalm 150 was able to stop with singing to the Lord?