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What the study actually says is:
If you're out of shape, surprise surprise, a sudden increase in physical activity can drive your out of shape heart into cardiac arrest.
If you've had a heart attack and you don't exercise regularly, surprise surprise, a sudden increase in physical activity can drive your out of shape heart into cardiac arrest.
If you exercise regularly and are in shape, surprise surprise, no worries.
Goddamn slow news days.
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