Dr. Ghazi Racil is a PhD, at the High Institute of Physical Education and Sport ,Tunis, Tunisia, and graduated as Physical Education Teacher in 1987. I then joined the research group in the Faculty of Sciences in Tunis at the Departement of Biological Sciences in 2010, and I was recruited at the Institute of sports in Ksar Said in Tunis. I received my PhD degree in 2015 at the faculty of Sciences in Tunis. I currently work at Exercice physiology and body composition . I do research in Diabetology, Nutrition and Dietetics and Nutritional Biochemistry. My current project is 'perceived exertion and training in young obese.' indeed I am working on motor skills in the young age and the effect of rhythm in performance developement.