Rennes Templar wrote: “Many people and athletes who were vaxxed die as a result of aerobic exercise. Once the heart rate and circulation begin to increase dramatically, the clots break off from vessel linings and travel to the heart or brain. I advise anyone who has had the vaxx not engage in strenuous exercise, easy walking at the most.”
Typical anti-vaxxer false narrative. Atheletes dying from cardiac events have decreased, not increased. Since the overwhelming majority of athletes have been vaccinated, there is no reason for athletes, or anyone else, to modify their exercise regimen.
Here’s one credible source that disproves your thesis:
https://www.mcgill.ca/oss/article/medical-general-science/athletes-vaccines-and-cardiac-deaths