It is desirable to know how to relax. Many people do not and for those who are suffering from stressful and anxious medical and spiritual conditions, it is even more important to learn how to relax one's body, mind, and spirit.
As Christians, we do this through worship, scripture, and also progressive relaxation techniques in which one tightens and then relaxes muscles in a progressive manner to reduce muscle tension in the body.
Christian relaxation should not be confused with non-Christian relaxation techniques such as TM, Eastern meditation, guided imagery, hypnosis, alternative religious practices such as Yoga, reiki, occultic practices, etc... even when they call wrongly call themselves Christian.