Are you writing as much as you want to be writing? This group offers a focused hour of writing on whatever project you choose. You could work on a novel, essay, blog post, poetry, a dissertation, a journal entry, etc.. You don't need to show anyone in the group what you have written.
If you aren't sure what project to work on, you might want to do a free-write.
Wikipedia defintion of free-writing:
"Free writing is a prewriting technique in which a person writes continuously for a set period of time without regard to spelling, grammar, or topic. It produces raw, often unusable material, but helps writers overcome blocks of apathy and self-criticism."