Mindfulness- and acceptance-based approaches such as Acceptance and Commitment Therapy (ACT) and Mindfulness Acceptance Commitment (MAC) are gaining momentum with sport psychology practitioners who work to support elite athletes. These acceptance-based, or third wave, cognitive behavioral approaches in sport psychology highlight that thought suppression and control techniques can trigger a metacognitive scanning process, and that excessive cognitive activity and task-irrelevant focus (self-focused attention such as trying to change thoughts) disrupts performance.Using this perspective, the aim of sport psychology interventions is not to help the athletes engage in the futile task of managing and controlling internal life. Rather, it suggests that sport psychology practitioners should work to increase athletes’ willingness to accept negative thoughts and emotions in pursuit of valued ends.Key aspects of such interventions include: teaching athletes to open up and accept, teaching athlet