Julius Mack plays beach volleyball and competes in the federation “Bayerischer Volleyball-Verband”.
Currently listed in BVV U14 Herren 2025 (rank 10, 225 points); BVV U16 Herren 2026 (rank 64, 92 points); BVV U16 Herren 2025 (rank 127, 34 points). Ranking seasons: 2025–2026.