If you are doing any type of exercise and you become breathless and unable to talk normally this is a sign that your body is overworked and needs to stop. You need to lower your heart rate and bring your body back to homeostasis. In order to do this, stop what you are doing and go inside where you can rest. If you are breathless you are in danger of passing out. The safest place to be is inside.
The benefits of eating healthy is because if you eat healthy it gives your body the nutrients to function properly and exercise is good because it helps build your muscles and can even improve your mental state by raising your self esteem.