2k
Possibly one of the most evil and physically demanding activities that an athlete can ever be forced to attempt. 2000 meters rowed either on the water or on an erg.
Example:
After learning that they had a 2k the next day, the entire team was thinking, "Awww, shit."
After learning that they had a 2k the next day, the entire team was thinking, "Awww, shit."