Here is a useful resource for battling depression. It comes in a book titled, The Upward Spiral: Using Neuroscience to Reverse the Course of Depression, One Small Change at a Time. It is authored by Alex Korb, PhD. Dr. Korb, a neuroscientist conducting research at the University of California, Los Angeles.
He advocates using yoga, mindfulness, exercise, and humor fight depression. This first book (of hopefully more to come) is written for laypersons, and it has received 4.7 out of 5.0 stars from 100+ reviews on Amazon. The idea is that many of the millions of sufferers of depression can benefit by using positive mental and physical activities to take small steps toward mental health, and reverse the downward spiral that leads to this devastating mental illness.