Ключевые слова: ache, adult, asian, athlete, concept, exercise, fit, fitness, health, healthy, hurt, injured, injury, jogging, joint, knee, legs, lifestyle, male, man, marathon, medical, morning, muscle, nature, osteoarthritis, outdoor, pain, painful, park, patellar, patellofemoral, people, physical, race, recreation, road, runner, running, shoes, sport, sprain, summer, syndrome, tendinitis, tendon, training, walking, workout, young,