Here are my two cents. It depends… mostly on your personal health situation, and risk benefit analysis.
Evidence is that physical activity will lower cardiac risks post mi for example (arguably better than any one single therapy), if you can tolerate it. However, much of that data is based on your more average joe/jane who probably needs to get off the couch more anyway. There are no large randomized controlled double blind studies of the risks of triathlon participation post stent in people over 70. Case studies and isolated examples, (some recorded in documentaries) at best. You are the 0.0001%, and i bet your need for a stent was 99% not due to poor lifestyle. I am making big assumptions, but we are in a tri forum…
But I agree with others that the bigger issue here is one of risk of bleeding. Mainly, bleeding in an accident. I also cringe at the thought of endurance running/biking on pressure points on significant blood thinners. It makes my “t’aint†squirm.
But the bleeding risk very much becomes personal. Kind of like concussion. Yes, in an accident, your risks may go up. But do you stop driving, skiiing, cycling, etc? That is a personal choice. No exercise may make tou depressed. That could be a far worse outcome for quality of life. Just be ready to live with the consequences of your decision one way or another.
Baby steps, go from there. Your body, time, and good medical info will help guide you.
If i could give general wisdom that will probably work for 90% of people, irrespective of diagnosis or question; it would be that the answer is usually in between. The people that gravitate to extremes for an answer are the people that generally get in trouble. That being said, you are already 0.0001% (ok, i made that number up), so what may be extreme for someone else, may not be for you. Your bar will be different from grandpa-off-the-couch.
But the bleeding risk… that is up to you to decide what you are willing to risk. Just be sure to get informed medically so that you can make a decision with the best info possible (realizing that no one has a crystal ball).