Ключевые слова: 2025 years, 20s adult, 2530 years, accelerate, accelerating, acceleration, action, active, adults, african american ethnicity, african americans, africanamerican, aligned, aligning, americans, athlete, athletics, athletics track, black american, blacks, caucasian, compete, competing, competition, competitions, competitive, contest, early 20s, early twenties, ethnic, females, foot race, footrace, group, group of people, groups, guy, guys, human, human being, in a line, in a row, ladies, lady, late 20s, late twenties, line, lined up, lines, males, man, men, midadult, midadult man, midadult woman, motion, movement, outdoors, outside, people, photography, race, races, racetrack, row, rows, run, runner, runners, running, running race, running track, side by side, speed, speed competition, speedy, sporting event, sports, sports event, track, track field, track and field, trackandfield, twenties, twentysomething, velocity, whites, woman, women, young, young adult man, young adults, young man, young men,