I think the answer would be A. When under stress, it can enhance a focus towards specific thing. Let’s take school for example- if you’re stressed about not having a good grade in a certain class, you might be more motivated and out focus into that’s subject. With that logic, option A would be fitting.
Some times the equipment is broken or doesn’t work as good as you like
Cardio is heart, because you heart pumps blood to the organs, tissue, and cells of your body.
The technique in having a flat stomach or not getting bloated is in choosing what you eat. You only have to eat food that are rich in fiber and drink water as much as your body need. You also have to limit food that are rich in sodium, most likely these are the salty food that you eat.
