Нужно изменить слова, поставив их в другой форме (подходящей). doctors insist that their patients can make a significant improve in their quality of life without any pain treatment but simply by doing twenty minutes of walking every day. in the first place it refers to weight people whose illnesses are often consequences of their obesity. sad its an obvious fact lots of people who live in a megapolis spend most of their life sitting or lying. we sit at school and in the officce, we sit in front of the tv or computer and lie on the sofa. we may not be aware of the fact, but actually we don't do enough exercise. isn't it the right time to think for a moment and to choose an active life and health eating habits rather than pills and inject?
