If you are exercising in your target fitness zone, you are between your threshold of training and your target ceiling.
If you achieve a good fitness rating, you probably are at the level of fitness needed to live a full, healthy life.
These are what I found on Quizlet.
Answer: The answer is Adaption-level Phenomenon
Explanation: Adaption-level phenomenon is a tendency which people have to adapt fast to a new situation until the situation becomes the norm. They get used to such situation such that it is no longer big deal to them anymore and another new experience is needed. If a new situation seems better than the current state the person feels better but only for a little while, if the situation however feels like a step backward, the person becomes sad and frustrated.
Answer:
When you are exercising, your muscles need extra oxygen some three times as much as resting muscles.
This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing
