Once you enroll in a plan that offers SilverSneakers benefits, you should receive a welcome package in the mail. This kit will include your SilverSneakers membership card and any essential information you should know about the health and fitness program. To activate your membership card, you will need to visit the SilverSneakers website or call the phone number provided in your welcome kit. Once activated, your SilverSneakers membership card can be used at any participating SilverSneakers location nationwide. If you have any issues with your membership or need to request a new card, SilverSneakers customer service will be available to help you with any issues that arise.