Hello and welcome to Apple Support Communities
Thank you for contacting us. You have come to the right place and we are happy to assist you. We understand you're having an issue with your iPad not syncing to Library. We can understand why you’d reach out for a solution. To start, do you have a watch? If so, is it a Series 3 or above with Watch OS 7.2 or above?
Devices you can use with Apple Fitness+
You must have an Apple Watch Series 3 or later with watchOS 7.2 to access Apple Fitness+ on the following devices. Make sure that you're signed in with your correct Apple ID and that Bluetooth is enabled on all devices.
If you need further assistance after reading the link above, please don't hesitate to reach out.
Thank you for contacting Apple Support Communities.
Best regards.