00520naa#a2200169#i#450# EN\\bibl\123078 20260713135328.1 3034-4689 20260508b2026####ek#y0engy0150####ca RU FITNESS EXERCISE CLASSIFICATION BASED ON THE XGBOOST MACHINE LEARNING MODEL Journal article Kazan Kazan National Research Technological University 2026 4 с. Journal article local Il'in Aleksandr Romanovich vestniktu.ru