I'm using a Galaxy Watch (7BE9), model number SM-R800, with One UI version 1.5, Tizen Version 22.214.171.124, SW version R800XXU1DSL1
I have installed Endomondo from the Galaxy Store at version 2.4.2 (2-Apr-19)
It is so full of bugs that it is pretty much unuseable:
The app has evidently never been properly tested, yet for some reason it has Samsung's endorsement (because it is offered in the Galaxy Store). It carried the Under Armour logo and is (obviously) associated to the excellent phone/tablet/PC version of the Endomondo app.
It is a total embarrassment to all concerned.