When do we say that work is done?
Whenever you do anything like standing, reading... people say you do work but actually physics will say you don't, because in physics work is defined when force makes a body move by a distance. In the above cases of reading and standing you neither apply force nor do you displace yourself.
Work done = force x displacement.
There are 2 conditions to be satisfied for work to be done.they are-a force should act on an object and the object must be displced . if we apply foce and if the object is not displaced then the is not done. for example- we are pushing a wall in this case we are applying force but the is not displaced.hence the work is not done