Novel Interventions for GWVI

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 Ta…