Answer:
A subdural hematoma.
Explanation:
She remembers the injury so we know it isn't a occult subdural hematoma. Whereas what is described here is a blood collection inbetween the dura mater and arachnoid layer's of the brain.
In the middle of your chest. Hope that helps
Aerobic exercise like running, jogging, swimming and walking because all of these get your heart rate up.