Summarized List: Status Effects
A creature is Winded when it recently performed some physically-intensive activity and is out of breath.
Creatures take a -1 penalty on checks that use Strength, Dexterity, and Constitution for each level of Winded. Subsequent effects that inflict the Winded status effect stack and increase its level. A creature that receives one or more additional levels of Winded after reaching Winded 3 instead suffers a level of exhaustion.
Physically strenuous activities might make a creature Winded, such as rapidly climbing a steep hill or sprinting a great distance.
The Winded status effect is reduced by 1 at the end of the creature's turn if the creature didn't gain any levels of Winded that turn.