There is always the fear that you are committing to a gym membership long term when you first sign up but luckily, most gyms make it easy for you to cancel. However, it is important to look through the terms and conditions of your membership contract as you may have to pay cancellation fees.
On the other hand, if you are afraid you may not enjoy the gym once you have joined, gyms we mentioned earlier like PureGym, The Gym and JD Gyms/Xercise4Less all offer zero contract memberships.