Holistic Healing and Self-Improvement

What does the Bible say about universal holistic healing and self-help? From yoga to essential oils to touch, many claim their way is the right way to heal the body. What does it mean to obtain healing and self-help in a 'universal holistic' way? Is there danger of mixing in other religions and religious practices into Christianity? To tackle this question, we have to see if we're stepping into ground we should avoid, whether intentionally or accidentally.