A fun way to pray and get exercise when you are in a group-esp. a group of younger pray-ers is to play Musical Prayers. It is kind of like Musical Chairs, with a difference. In Musical Prayers, you put squares on the floor around the room. Each one has a different type of prayer. You play music and move 'round from square to square until the music stops. Each person then does the prayer action on their square.
Some of the ideas you could use are:
Shout out one thing you are grateful for.
Stop and ask God what He wants to say.
Ask God for something you want/need.
Ask God for something a friend wants/needs.
Thank God for a person in your life.
Thank God for a gift.
Shout out the name of a person you hope will be a Christian.
Confess something.
Forgive someone.
This prayer activity is a great way to work off some energy and pray at the same time.