Improving Walking Quality and Quantity in Osteoarthritis (IWALQQ-OA)

Inclusion Criteria: * age 50-80 years * BMI ≤40 kg/m2 * Meet American College of Rheumatology clinical and/or clinical+radiographic criteria for knee osteoarthritis * Knee pain score ≥ 4 during last week * Predominantly medial knee pain * Predominantly medial knee radiographic osteoarthritis with or without radiographic patellofemoral osteoarthritis * Ability to ambulate for a minimum of 20 minutes, without any assistive device * Available for the study duration * Own a smartphone * Can speak and understand English Exclusion Criteria: * Contraindications to exercise * Using orthotics for knee pain such as knee braces, wedge insoles * Knee injection in previous 3-months * Currently receiving physical therapy for knee pain * Planning major treatment for knee pain (e.g., physical therapy, surgery) in next 6 months * Self-reported joint diseases like rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, gout, etc. * Self-reported total joint replacement in any lower extremity joint * Self-reported neurological conditions like stroke, Parkinson's disease, etc. * Self-reported muscular disease like muscle dystrophy * Self-reported musculoskeletal or neurologic conditions that affect gait.