The correct answer is go inside to rest.
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.
