I stuck out my gym membership for 2 years... On average over that time I would attend 4 days per week. I joined to shed the post baby kilos, and it really did work.... I loved it!
I have taken 6 months leave on my membership over this pregnancy though, being that I am just too physically exhausted to work out properly, and am doing heaps of walking as it is (which is really all I need)... but I tell you I am SO excited at the thought of going back to gym after this bubba!