I am a 38 year-old female, I work as a fitness trainer and
yoga instructor and am in very good physical condition. I started doing Crossfit (high-intensity aerobic exercise) about 2 months ago. Today, a couple of minutes after completing a high-intensity workout of rowing, jumping and running, I experienced intense pressure in my chest that took several minutes to go away. The intensity of the pressure was constant; it didn't change with inhalation or exhalation.