Author Kristen Johnson Ingram was photographing Native American dancers at an Oregon pow-wow when an official tapped her on the shoulder and asked her to stop taking pictures. "This is the prayer the dancer is doing," he explained.

For people of faith, Ingram realized, there are many forms of prayer besides the ones we speak with our lips: Devout Jews bow while reading Torah; Episcopalians stand, sit, or kneel in church; exuberant Christians raise their arms; and mystics of all denominations walk while murmuring the Jesus Prayer. As Christians, we can use our entire bodies to...