Performance peaks at lower levels of arousal for difficult tasks, and at higher levels for easy or well-learned tasks. (1) How might this phenomenon affect runners? (2) How might this phenomenon...

 Performance peaks at lower levels of arousal for difficult tasks, and at higher levels
for easy or well-learned tasks. (1) How might this phenomenon affect runners? (2)
How might this phenomenon affect anxious test-takers facing a difficult exam? (3)
How might the performance of anxious students be affected by relaxation training?