The document discusses the concepts of sports training. It defines sports training as a planned and controlled process aimed at improving motor performance and abilities through systematic effects on physical and mental performance. The key principles of sports training discussed are continuity, overload, individual differences, general and specific preparation, progression, specificity, active involvement, variety, warm up and cool down, rest and recovery, and ensuring results. Warming up is defined as light physical activity performed before training to prepare the body physically and mentally. It increases body temperature, flexibility, and performance while reducing injury risk. Specific warm up exercises target the muscles used in the upcoming activity.