Effects of an 8-week Mindfulness–Acceptance–Commitment intervention on competitive anxiety, mindfulness, and 200-m sprint performance in junior female sprinters: a quasi-experimental study - Chiraz Goumni; Amayra Tannoubi; Aymen Hawani; Riadh Khalifa; Medina Srem-Sai; John Elvis Hagan; Vlad Adrian Geantă (Sport Sciences for Health, 2026)