Below the sign-in form are Continue with Apple and Continue with Google. With these you create an account or sign in without a password.
What we get from you. Your name and your email address. If you choose hide my email with Apple, we get a forwarding address from Apple. That works fine; email from us then reaches you via Apple.
Already have an account with the same address? Then you end up in that account.
An invitation from your gym. It belongs to an email address. If you sign in with Apple or Google using a different address, you won’t see the invitation. Then use the address the invitation came to, or ask your gym to send it to the right address.
After signing in. If you haven’t filled in a name or profile yet, the app asks for that first.
Apple isn’t available on every device. On an Android phone you use Google, or your email address and a password.