Ключевые слова: action, activities, adaptation, athletes, caucasian, competition, dirt, dirty, efficient, endurance, energy, exercise, extreme, feet, fitness, forcemuscle, hand, hands, hard, health, human, implementation, jog, labor, leisure, lifestyle, male, man, military, modern, mud, obstacle, performance, power, practice, race, rope, run, runner, specific, sports, step, training, tug, war, work,