The first choice because with rounded shoulders, your body is going to be tensed and won’t allow you to move as fast. If you put your hands on your chest, yes, your feeling your heart but you just don’t put your hands on your chest when running.
Preservatives are added to foods to help prevent or slow spoilage due to bacteria, molds, fungi or yeast, as well as to slow or prevent changes in the food's color, flavor or texture, delay rancidity, and maintain freshness.
<em> Hope this helped! <3</em>
