Ключевые слова: abdominal, abdominal muscle, abs, adult, athlete, body building, body building exercises, bodybuilder, bodybuilding, calf, calves, fit, flexing muscles, guy, gym, handsome, health and fitness, health club, healthy eating, healthy lifestyle, human leg, human muscle, indoors, leg, lifestyles, machine, male, man, muscular build, power, quadriceps muscle, sport, sports and fitness, sports training, strength, strong, symmetry, the human body, weight training,