Marathon Health in Chula Vista delivers employer-sponsored advanced primary care from a Fourth Avenue clinic, extending the company's network of worksite health centers to San Diego's South Bay. The clinic's scope covers acute-care visits, chronic-disease management, and musculoskeletal screening with referral pathways to Manual Orthopedic Physical Therapy, Inc. for post-injury rehabilitation. Formed through the merger of Everside Health and Marathon Health, the combined entity operates onsite, near-site, network, and virtual primary care models for employer groups from its Burlington, Vermont headquarters. Patient visits at this Fourth Avenue location average more than 30 minutes, allowing comprehensive assessments that combine preventive screenings, immunizations, and behavioral-health check-ins within a single appointment. The occupational-health panel covers DOT physicals, pre-employment drug screens, and respirator-fit testing for area employers whose workforce also accesses spinal-adjustment care at The Joint Chiropractic. The clinic's population-health analytics platform stratifies enrolled employees by chronic-disease risk tier, enabling targeted intervention protocols for hypertension, prediabetes, and metabolic-syndrome cohorts.