Nimble is a Passive Racial skill that appears in The Elder Scrolls Online.
This skill has had a few name changes over its time. Originally known as Robust, it was renamed to Robust Constitution with Update 7. , and renamed again to Nimble with Update 11. 
- U7: Removed the Robust passive, and replaced it with Robust Constitution. This will increase your Health regeneration by 6/13/20% and Stamina regeneration by 3/6/10%. 
- U11: This skill has been renamed to Nimble.