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Platinum I can't explain it well like they did but I can try. Stage 2 is a stage where you are still considered healthy. You only have some issues where you feel normal at rest but when you do some things your heart rate Jack's way up,you have issues breathing,you feel fatigued, nausea, lightheaded feelings.
Best example I can give was when I was hauling stuff to the attic. Something anyone should be able to do no problem. My heart rate went through the roof, felt cold but sweaty, had issues breathing,felt fatigued and felt really sick and off.
You can't cure it but you can help slow it down with medicine and lifestyle changes.