Ok, it seems like ‘strength training minutes’ is not hooked up to anything – I can get Fit to show synced workout minutes to me in the app but they just show up as ‘other’, and beemind.me doesn’t see them.
I could use beemind.me with ‘active minutes’ but that counts both synced workout minutes and any minutes that Fit thinks I’m walking because my phone is moving (which I don’t know how to disable, but perhaps I will try uninstalling the Fit app.)