The Jesus Prayer is a contemplative and meditative prayer that we can use because while we pray it, we are also taking relaxing breathes.
The prayer is:
Jesus Christ, Son of God (Said while inhaling a breath)
Have mercy upon me for I am a sinner (Said while exhal-ing)
The symbolism of the prayer is one in which while pray-ing this prayer repeatedly, we are taking in Jesus with every breath, and getting rid of sin by exhaling.