Constitution

Constitution measures health, stamina, and vital force.

Constitution Checks

Constitution checks are uncommon, and no skills apply to Constitution checks, because the endurance this ability represents is largely passive rather than involving a specific effort on the part of a character or monster. A Constitution check can model your attempt to push beyond normal limits, however.
The DM might call for a Constitution check when you try to accomplish tasks like the following:

• Hold your breath
• March or labor for hours without rest
• Go without sleep
• Survive without food or water
• Quaff an entire stein of ale in one go