Of course.
When I ran EoG2 I was reading/listening to books/audiobooks about building wealth, leadership skills, internet marketing etc.
On Emperor I was constantly working out, putting up things for sale, reaching out to people for little sidejobs…
On LBFH/EoG1/Khan1 it was mostly about deep introspection and journalling (which you should do anyways) and understanding myself and my relationships with people/money
Think about your goals and any way you can support their realization.
It doesn´t necessarily have to be something “big” everytime, @Skadoosh had a good post about that.
Reading 20 pages/a 10 minute article about coding? = Action
Doing 300 push ups? = Action
Consciously reflecting upon your past? = Action
Doing research about how you can monetize your skills? = Action
Improving your diet? = Action
Getting out to new places/events to socialize, meet women? = Action
…