Physical Fitness Level in 9–11-Year-Old Italian Children Is Affected by Body Mass Index and Frequency of Sport Practice but Not by Peak Height Velocity and Relative Age Effect. - Varalda, Mattia; Ungureanu, Alexandru Nicolae; Coassin, Alberto; Maffei, Nicolò; Li Volsi, Damiano; Brustio, Paolo Riccardo; Lupo, Corrado (Sports (2075-4663), 2026)