Read Busiest People Ever . The work they do is both physical and mental. People who do physical work move around a lot and use their muscles. They also have to think about what they're doing so that they don't make any mistakes. Thinking is mental work.
Most workers do some mental and some physical work.
For example, carpenters and plumbers do both physical and mental work. Ask the students what other jobs have people doing mostly physical work. Explain that other people have jobs where they must sit at a desk and think about their work. Some people who do mostly mental work are accountants, teachers, and authors. Ask the students what other jobs have people doing mostly mental work.