Not 100%. About a third of people recover fully within 3-4 months, but if it's beyond that, you're likely stuck. I am, however, one of the few that got up to 80-90% of normal a couple of years afterwards. My primary cardiologist said in 20 years of practice, I was one of the only three patients that he treated that did this.

I credit returning to long distance running. I don't recommend it as a treatment. Not scientifically studied and was/is definitely against doctor's orders.