Ключевые слова: agility, arms, athlete, athletics, boys, competition, coordination, copy space, dynamic, exercise, explosive, fitness, flexibility, high school, kids, legs, line, on your mark, outdoors, overhead, position, power, practice, race, real people, runners, running, set, shorts, side view, speed, sports, sprint, sprinters, sprinting, start line, starting, starts, team, teenager, track, training, view, workout, young,