If you agree to participate in our research study, you will be asked to come to the Psychology of Sport Injury Lab in Fetzer Hall and Woolen Gym on UNC at Chapel Hill's campus for up to 7 sessions over a 5-week period. These sessions will include baseline measurements, assessments, and mindfulness training sessions. The purpose of the initial assessment and screening session (~2 hours) is to explain the study, ensure you meet all inclusion criteria, complete a neurocognitive function task (reaction time), and questionnaires about your knee health. You will watch a 30-minute educational video about cognitive behavioral therapies. Then, the primary investigator will guide you through an imaginal exposure task. During this task, you will mentally imagine having a secondary ACL injury and the rehabilitation process. After this task, you will complete a writing assignment to express and confront your fears. The rest of the study consists of 5 training sessions, which will last 1 hour each where you will engage with your reported fears with the primary investigator. You will complete 4, 10-minute mindfulness sessions each week throughout the 5-weeks using a mobile app. The final assessment (~2 hours) will occur after 5 weeks following the first training session and would involve the same series of tests related to the baseline visit.