Ключевые слова: abdominal, abs, active, adult, athlete, body, bodybuilder, bodybuilding, caucasian, confidence, crunch, crunches, effort, exercise, exercising, fit, fitness, floor, gym, health, healthy, healthy lifestyle, horizontal, indoors, instructor, lifestyle, lying, male, man, men, motivation, muscle, muscles, muscular, one, people, physical, sit, situp, sport, strength, strong, training, up, ups, vitality, working, workout, young,