What do you do in the process of waiting for clients?

[Btaliat]

There are many things to be done by the freelancers while waiting for new tasks to be done. Some of them always engage themselves in other things to fetch them money. Others may decide to be marketing themselves or even be leaning new skills that they believe will be of help to them when it comes to freelancing. What do you always do while you are waiting for the clients to give you tasks?