Which of the following is true concerning the use of pre-performance activities to stimulate athletic performance? Which of the following is true concerning the use of pre-performance activities to stimulate athletic performance? Priming is generally harmful, so it should not be used except under extraordinary conditions. Priming may be effective, however, one should keep in mind that priming effects last for as little as 5 minutes. Pre-performance activities should be introduced 2 weeks before an upcoming competition and then a "re-fresher" should be re-introduced 1 week before the competition. Such activities are not recommended because priming has not been found to be effective