I learned this song in Sunday school. Start the song in a scrunched position and as you say "grow", grow taller and when you say "shrink" shrink back down. Each line can be repeated several times to grow so you can grow as fast as you like, and it will help the children remember it faster.

If you read your Bible and pray everyday you will: grow, grow, grow
But if you neglect your Bible and forget to pray you will : shrink, shrink, shrink
So we will read our Bible and pray every day so we grow, grow, grow.