Begin by completing simple stretches and exercises at home in front of them for two weeks, and then go to them and tell them you want to become serious about your fitness. They'll trust you since they've seen you've been doing it for two weeks, therefore they'll be more inclined to give you the membership. If they say no, just keep showing them that you're going to use the facilities every day until they say yes. If you really want your parents to let you have a gym membership, then you should show them that you're responsible and won't abuse the system. For example, if they give you permission to join, then make sure you go three times a week to maintain your health. If they see you reading or watching television instead, then they might change their mind later on. Finally, demonstrate how much better you feel when you're physically active. Let them know that you want to live longer and healthier than they do, and that you need their support to achieve this goal. Tell them you hope you can have this conversation with your parents someday too! Getting a gym membership can be difficult if you don't belong to any clubs already, but it's an important step in losing weight and maintaining our health. We should all have the chance to improve our lives through sports and exercise, so if you really want to get your parents to agree, then you should start now by joining a club or exercising regularly without waiting for permission first.