Having a gym membership doesn’t make your fit. Turning up and working out does. If you are one of the 553,000 people who own a gym membership and don’t even go once a week then it is probably time to find another strategy to get fit.
There are so many options to get fit without stepping inside a gym. There is plenty of free information online on exercises to do and how to do them, or just going back to basics such as moving your body. It depends on how motivated you are to achieve your goal.