But it must be understood, that unless designed otherwise, i.e. unless the Units of Analysis are chosen from all people, most studies are generalizable only for a much narrower population of the people w/in a nation, region, city, etc.
exercising - the activity of exerting your muscles in various ways to keep fit; the doctor recommended regular exercise; he did some exercising; the physical exertion required by his work kept him fit. exercise, physical exercise, physical exertion, workout.
(third-person singular simple present exercises, present participle exercising, simple past and past participle exercised) To exert for the sake of training or improvement; to practice in order to develop. to exercise troops or horses; to exercise one's brain with a puzzle; To perform physical activity for health or training.