Thanks for your questions. Blood typically doesn't pool with exertion, but can pool after exertion during rest. If there is visible "pooling" with exertion, it may be worth discussing with your doctor as it may indicate a significant elevation in the pressures on the right side of the heart. As for the water balloon in the chest, I'm not sure what this could be referring to. If there is a significant amount of fluid around the heart, i.e. a pericardial effusion, one may notice this on exam but it would be uncommon. If your doctor feels it is warranted, an echocardiogram (ultrasound of the heart) might give you some answers. Best of luck.
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