I just spent a solid whack of time in the mountains , six full days out of the last eight hiking in Garibaldi Provincial Park . And I could n't be happier still feeling the burn in my legs . It started last Sunday with a 30-plus kilometre day trip into the Diamond Head area .
What is causing the narrator to be presently so exhausted ?
Pick the best answer from the following options:
- None of the above choices .
 - They could n't get to bed .
 - They did not sleep the night before .
 - They just hiked a great distance .


They just hiked a great distance .