Transferring to another gym is easy!
Simply ask your new gym owner to add you to their gym and provide them with the email that you used at your previous gym. Once you are an athlete at your new gym you will receive a Welcome email that will prompt you to confirm your email address and walk you through the account merging process.
To get more information on merging your account, check out this help article.
Concerned about losing your performance history? Don't worry! When your account gets merge all performance history data should be merged. This will keep your performance history all in one place.