Constitution ability check or Constitution Saving Throw?

@JeremyECrawford When would I ask a player to make a Constitution ability check, that isn't more appropriately a Constitution Saving Throw?

— Arcknight (@ArcknightGames) August 24, 2016

See page 237 in the DMG. It gives suggestions for different types of ability checks, including Con. checks. #DnD https://t.co/QIdxCSSAGS

— Jeremy Crawford (@JeremyECrawford) August 24, 2016