I know of one officer locally who was kicked in the chest after an arrest and he died of some kind of heart failure. http://www.odmp.org/officer.php?oid=6223 I never knew the guy personally and can't find a photo offhand, so I don't know what outward appearance of 'shape' he had, but I do know you can look skinny and still have heart problems. Weight doesn't help absoluetly, a guy weighing 300 lbs has to work his heart twice as much as a guy weighing 150, but again 'risks' aside there are still cases that would shock the mind I'm sure.
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