During my class 1, there was an anomoly on the ECG.
After not eating since breakfast ECG was the last test, anomoly appeared on 2 attempts. Doctor said wait until end of day and try again when I'm hungry - apparently heart beat settles (was already starving) - which we did, again anomoly.
Was then asked to do the exrcise ECG (treadmill at walking pace with inreasing incline until just before the moment you begin to run) was then informed that it did not repeat, issued class 1, still have no idea what the initial concern was, but I'm still around.