Sessions and Google accounts
One session for each Google account, with its own sign in, settings, and history.
One session for each account
A session holds the sign in for one Google account plus everything you set for it. Two sessions never share settings, so you can run a slow walk on one account and a brisk one on another at the same time.
The name you give a session is only for this app. What Google shows is set separately under Name in Google Fit.
How many you can connect
Each account type has its own allowance. Basic, dynamic, and tester accounts connect up to five Google accounts, pro accounts connect ten, and admin accounts have no limit.
When you are at the limit, disconnect a session you have finished with and the slot comes back. An admin can also set a different allowance for a dynamic or tester account, and a limit of 0 there means no limit at all.
If your limit goes down while more Google accounts are connected than it allows, the ones connected most recently are locked. Their runs stop, but nothing is deleted, and the session says it is locked. Disconnect an account you no longer need, or have your limit raised, and the locked sessions unlock on their own and can run again.