LIFTY
Many questions are answered in the FAQ.
Questions, bug reports or ideas: Lifty@alexkvam.dev. Include your iPhone model and iOS version if something is not working.
Lifty Pro is billed and managed by Apple. To cancel or change your plan, open Settings on your iPhone, tap your name, then Subscriptions. To get your purchase back on a new device, use Restore Purchases in Lifty's Settings.
Workouts sync through your private iCloud account, so make sure you are signed in to iCloud and iCloud sync is on for Lifty.