If you exercise intensely what can happen to your respiration?
Options:
- tiredness
- shortness of breath
- injury
- fitness
- thirst Let's think step by step:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
If you exercise intensely, shortness of breath can happen to your respiration. So, the answer is shortness of breath.