Yoga Training for Returning Veterans With Headache

The objective of the study is to evaluate the efficacy of a yoga treatment for veterans with mild post-traumatic and chronic tension-type headaches. Study Aims: * Does this yoga treatment, targeted toward specific symptoms veterans with mild post-traumatic and chronic tension-type headaches experience, assist in decreasing headaches and associated symptoms? * Does this yoga treatment, targeted toward specific symptoms veterans with mild post-traumatic and chronic tensions-type headaches experience, assist in improving quality of life? * Does this yoga treatment, targeted toward specific symptoms veterans with mild post-traumatic and chronic tension-type headaches experience, improve mood? * Do the effects of yoga on symptoms, mood, and quality of life maintain 2 months post completion of treatment?