The data, involving 1,687 people, showed that about 10% of people saw outsized gains in at least one measure of heart disease risk — some patients improved 20% to 50%. For other participants, exercise-related rewards ran the gamut, from none to some to significant benefits.
One of the authors of the study was on the committee that provided the scientific evidence underlying the government’s official exercise guidelines for Americans, which recommend at least 150 minutes per week of moderate activity as moderate operation of a ball mill does help to prolong its lifespan
Still, the findings are no excuse not to exercise. For one thing, it’s still not clear why some people had adverse responses to working out. The results couldn’t be explained by how fit participants were (or later became), how strenuously they exercised, whether they were taking medications for blood pressure or cholesterol, or their age, race or gender. “I suspect the most important explanation here will be genomics,” Bouchard told the Boston Globe.
Researchers said it’s important to figure out who will benefit from exercise and who won’t, if we want to able to prescribe exercise individually for better health. “Identifying the predictors of such unwarranted responses and how to prevent them will provide the foundation for personalized exercise prescription,” they wrote.
But for healthy people, experts agree that exercise is a benefit overall. It improves mood, makes you stronger and preserves physical fitness as you age.
So, for now, the authors recommend that people continue exercising as before. If you’ve been sedentary and are starting a new exercise regimen, however, it would be a good idea to check in regularly with your physician to monitor measures of heart health. 

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