A three-arm, parallel groups, randomized controlled trial (NCT05698368) was designed per SPIRIT guidelines, recruiting participants via social media, flyers, email, and word of mouth. Participants, aged 45+ with knee osteoarthritis, were randomized into mindset intervention, education intervention, or no intervention groups. The primary outcomes assessed post-intervention included Exercise and Osteoarthritis mindsets, with follow-up measures of knee pain and physical activity. Secondary outcomes included knowledge, body mindsets, and activity adequacy. Statistical analysis was conducted in R, evaluating mean change scores and differences between groups.