Take your pick ...
A middle school assistant cross country coach seriously telling the team before doing short, steep, hill repeats that the right effort should be feeling like you're about to puke.
A college cross country coach telling the team not to empty their bladders before the race because some energy can be extracted from the urine that may make a difference in where they place.
Inhale through your nose and exhale through your mouth when racing.
Get a massage to rub out the lactic acid crystals.
Carbs are bad for you.
Drink a gallon of water a day to flush the toxins out.