We all have arms and legs, muscles and joints that allow us to act, to grasp, to get up, to balance, to walk, to jump, to run, to climb, in short, to allow us to move.
Our life today does not always allow us to move as much as we should. We move little when traveling by car or motorbike, we use escalators and elevators. We spend a lot of time sitting in an armchair watching television, sitting at a computer working or sitting listening to a lecture.
Not moving is called sedentary lifestyle or physical inactivity and physical inactivity is only increasing in the world.