Inclusion Criteria:  Written informed consent; age 18-65 years;  DSM-5 diagnosis of  schizophrenia, schizoaffective disorder, bipolar 1 disorder,  DSM-5 diagnosis of schizophrenia, schizoaffective disorder, or bipolar 1 disorder including those with a co-morbid  alcohol use disorder or substance use disorder; clinically stable; no psychoactive medication changes for past 4 weeks; clinical global impression-severity (CGI-S) scores mild to moderately ill  Exclusion Criteria:  Unable to provide written informed consent; intellectual disability (i.e., severe enough to impact understanding of yoga-based exercises) based on chart or IQ<80 on the Wechslet Abbreviated Scale of Intelligence-II (WASI-II);  disability or illness precluding yoga-based exercises or wellness lifestyle program, e.g.,  current or recent angina (<6 months), history of myocardial infarction in the past year (unless permission is obtained from the primary care physician), uncontrolled hypertension or hypotension;  neurological illness complicating diagnosis / cognitive evaluation, e.g.,  dementia, stroke or head injury;  physical problems that preclude training for yoga-based exercises / wellness lifestyle program, e.g.,  severely impaired vision; ongoing treatment that includes more than one hour per week of relaxation and mind-body based stress reduction strategies related to yoga