Can tai chi ease gulf war Veterans' pain and fatigue?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Served in the 1991 Gulf War. * Meets criteria for chronic multisymptom illness (CMI) based on CDC criteria32 characterized by one or more symptoms of at least 6 months duration from at least two of three symptom categories: 1) musculoskeletal pain (muscle pain, joint pain, or stiffness); 2) fatigue; and 3) mood-cognition. * One symptom of CMI must be musculoskeletal or joint pain or stiffness of at least 6 months duration (in addition to fatigue or cognitive complaints of the CDC criteria32). * Not planning to relocate in next 3 months * English-Speaking: English is the only language to be used during the exercise training program. Our self-reported outcome measures are obtained from validated English-version questionnaires. In addition, using other languages would likely require separate classes, recruitment and instructors which are beyond our current study scope. * Has access to a home computer or device that will allow telehealth delivery of the intervention. Exclusion Criteria: * Lacks the capacity to provide consent * Major medical, psychiatric, or neurological disorder or has a moderate or severe traumatic brain injury, which could interfere with their ability to safely engage in Tai Chi exercises. * Change in psychotropic or pain medication during the past month * This will minimize amount of symptom change due to medication alterations * Once enrolled, medication changes are nonetheless expected and will be monitored * Regular current Tai Chi, mindfulness, or yoga practice, defined as at least three hours per week for more than three months. * Veterans with prior experience who do not currently engage in regular practice at this level will be eligible * Reports difficulty standing on feet for the majority of a Tai Chi class (approximately 60 minutes). * Participants who are disruptive or disrespectful or engage in behavior that threatens staff and/or participant safety may be terminated from the study. * Participants who are currently involved in another treatment study that might confound our findings (e.g., treatments for GWI, pain).