Petersen, Carl, and Nina Nittinger Nittinger. “Fit to Play™ & Perform-Rules of Recovery (part 1)”. ITF Coaching & Sport Science Review 19, no. 55 (December 31, 2011): 4–8. Accessed May 15, 2024. https://itfcoachingreview.com/index.php/journal/article/view/378.