Atria would be empty during the atrial diastole.
Hello,
It depends on a lot more things. Like what types of exercise you are doing, this will affect the areas you are exercising and therefore will effect where you see the results. It varies from person to person, maybe give it a month. However, some work out that often and won't ever see results, it just depends on your body.
Good luck.
Salt will dissolve in the water and so you can cook the water again to separate the salt and sand
A good idea what one could do in the off-season (considering one would do seasonal sports such as skiing) would be to either engange in activities that will preserve fitness - b, or to relax and recuperate; depending on the desire and wishes of the person - a.