Tendons are essential tissues that connect muscles to bones and transfer forces to enable movement. Instead of being uniform mechanical links, tendon properties can vary significantly across individuals and even within a single tendon. These differences in local properties may play a key role in determining how tendons function, adapt to physical activity, and respond to injury. However, most studies simplify tendons as uniform materials, overlooking potentially important variations that could influence health and healing. This research project will reveal how local changes in tissue properties affect tendon performance and cellular behavior. By improving understanding of how tendons function, this research will provide valuable information to guide translational efforts aimed at improving injury prevention, refining rehabilitation strategies, and inspiring new regenerative therapies. This study will also integrate research with education by developing new course materials on tissue heterogeneity, training interdisciplinary teams of student scientists, and engaging middle and high school students through interactive outreach activities that highlight the value of teamwork and interdisciplinary science. This project will determine how local tissue properties and spatial heterogeneity drive tendon mechanics and mechanobiology. Full-field maps of morphological, microstructural, compositional, and mechanical properties will be determined in tendons with differing levels of in