Sheesh. When you have a sore chest for a couple of hours after exercising, there are certainly a lot of things that you need to do before the doctors are happy with you… ECG (normal), blood pressure check (up a bit, then back to normal), then blood tests (results back in two days). Failing any key indicators showing up, there’s then a "Stress ECG" to do – the one where they make you run on a treadmill, and keep turning up the speed until you can’t do any more.
At least it’s put the flu that I currently have into perspective. Lesson learned: when you’re already feeling run down, don’t overdo it at the gym.