I think it's not a bad idea, for me to settle down, it maybe easy to "freeze" body movement, but it's not easy to try fill our thoughts with God's things for 15 minutes for me, esp. without the help of music or worship, just give thanks and thinking of Him.
I admire some brother sisters that could easily do this... Praise God.
but one way I figured can help me do this, is to pray in the spirit (i.e. pray in tongue), that helps me focus on Him.
DO try this at home :- )