People with disabilities face more barriers to physical activity—but technology is offering new hope. In this episode, we explore one of the world’s first exercise apps designed specifically for people with multiple disabilities. Dr. James Haley, a health psychologist from the University of Chichester, joins host Dr. Olli Tikkanen to discuss how co-designed mobile health interventions can support individuals with complex needs. Drawing from his PhD work at Loughborough University, Dr. Haley shares insights into the development and evaluation of the "Accessorize" app—an inclusive tool created during the COVID-19 pandemic to help people with various disabilities become more physically active. In this first part of their conversation, Dr. Haley explains how the app adapts to users with spinal cord injuries, amputations, or achondroplasia, allowing them to customize workouts based on environment, goals, and available equipment. He also discusses the outcomes of usability studies, the behavior change techniques embedded in the app, and the challenges faced in conducting feasibility trials with disabled populations. This episode is a must-listen for researchers, developers, and healthcare professionals interested in digital health, inclusive design, and physical activity promotion for underrepresented groups. ___________________________   This podcast episode is sponsored by Fibion Inc. | Better Sleep, Sedentary Behaviour and Physical Activity Research with Less Hassle --- Collect, store and manage SB and PA data easily and remotely - Discover ground-breaking Fibion SENS --- SB and PA measurements, analysis, and feedback made easy.  Learn more about Fibion Research --- Learn more about Fibion Sleep and Fibion Circadian Rhythm Solutions. --- Fibion Kids - Activity tracking designed for children. --- Collect self-report physical activity data easily and cost-effectively with Mimove. --- Explore our Wearables,  Experience sampling method (ESM), Sleep,  Heart rate variability (HRV), Sedentary Behavior and Physical Activity article collections for insights on related articles. --- Refer to our article "Physical Activity and Sedentary Behavior Measurements" for an exploration of active and sedentary lifestyle assessment methods. --- Learn about actigraphy in our guide: Exploring Actigraphy in Scientific Research: A Comprehensive Guide. --- Gain foundational ESM insights with "Introduction to Experience Sampling Method (ESM)" for a comprehensive overview. --- Explore accelerometer use in health research with our article "Measuring Physical Activity and Sedentary Behavior with Accelerometers ". --- For an introduction to the fundamental aspects of HRV, consider revisiting our Ultimate Guide to Heart Rate Variability. --- Follow the podcast on Twitter https://twitter.com/PA_Researcher Follow host Dr Olli Tikkanen on Twitter https://twitter.com/ollitikkanen Follow Fibion on Twitter https://twitter.com/fibion https://www.youtube.com/@PA_Researcher