Muscle and Movement With Anti-Obesity Medications

Inclusion Criteria: * Both males and females of all race/ethnic groups are eligible for participation in this study. * Age: Randomized Study: Adults that are 18 to \<60 years of age. Observational Study: Adults that are \>60 years of age. * Newly prescribed AOM (semaglutide, tirzepatide) for the treatment of obesity, approval for treatment (pharmacy, insurance, etc.), and the participant agreeing to start this treatment and continue treatment for at least 6 months (the participant will be recruited prior to this medication being initiated). * Body mass index (BMI) of \>27.0 kg/m2 with at least one weight-related complication (hypertension, dyslipidemia, obstructive sleep apnea, or cardiovascular disease) provided it this does not compromise the ability to safely complete the screening or outcome measures or to engage in the prescribed exercise interventions), or \>30 kg/m2 without weight-related complications. Enrollment will not be limited based on an upper BMI level provided that the participant meets the other eligibility requirements. However, weight or size limits of the dual-energy x-ray absorptiometry (DXA) system that is used to assess body composition must not be exceeded. * Ability to provide informed consent prior to participation in this study. * Clearance from the study physician for meeting all eligibility criteria for this study. Exclusion Criteria: * Type 2 diabetes. * Report moderate-to-vigorous exercise for \>60 min/week, and \>1 day of structured cardiovascular or resistance exercise over the past 3 months. * Report sustained weight loss of \>3% in the past 3 months. * History of metabolic/bariatric surgery. * Females who are pregnant, pregnant within the past 6 months, or reporting a planned pregnancy during the study period. * Report a current medical condition or treatment for a medical condition that could affect body weight or contradict engagement in any aspect of the outcome measures or interventions. * History of muscle conditions that may impact the quality of muscle or response to the study interventions (e.g., myopathy, muscular dystrophy, rhabdomyolysis, etc.). * Current congestive heart failure, angina, uncontrolled arrhythmia, symptoms indicative of an increased acute risk for a cardiovascular event, prior myocardial infarction or history of cardiomyopathy, coronary artery bypass grafting or angioplasty, conditions requiring chronic anticoagulation (i.e., recent or recurrent DVT). * Resting systolic blood pressure of \>160 mmHg or resting diastolic blood pressure of \>100 mmHg. If medicated for blood pressure control, the medication dose needs to be stable for \>6 months. * Eating disorders that would contraindicate weight loss or physical activity. * Alcohol or substance abuse. * Current psychological condition that is untreated, hospitalization for a psychological condition within the past 12 months, or not being on a stable dose of treatment for at least 6 months. * Report plans to relocate to a location not accessible to the study site or having employment, personal, or travel commitments that prohibit attendance at scheduled intervention sessions or assessments.