This popular guided meditation uses a relaxation technique called "passive muscle relaxation".  During this meditation, you will be asked to focus on all of your muscles being in a relaxed state. Focusing with intention in this way sends a signal letting the brain know that it's OK to relax creating a deep muscle relaxation response. Reducing muscle tension in this way leads to a greater sense of peace and calm. 
Click on link to sample audio
https://youtu.be/xcjTF5BxKdo
(please note that MP3 purchased version is a higer quality audio than the sample version on YouTube!)