Background: I was hoping to use Enhance Ability and its Bear's Endurance option to speed up our travelling a bit. But now I am not sure if it will work, hence this question.
Enhance Ability - Bear's Endurance lasts for 1 hour with concentration, and gives advantage on constitution checks (also 2d6 temp HP, but that's not relevant here). It does not specify "ability check", just "check".
Things like forced march, spell concentration and holding your breath actually call for constitution saving throws (see this related queston).
Does Enhance Ability help with saving throws?
In other words, is Bear's Endurance useful for the above, or does it only help with constitution ability checks (of which there are precious few, it's almost always a saving throw)?