Anyone taken an ectocardiogram before?

I'm scheduled for one next Thursday. It's a "stress-ECG", if that's the right term, apparently they measure the heart's electrical signals while you sit on a exercise bike and have at it.

I'm in good shape and all that, but my brother died early (age 41), and he died of *something*, so I'm just a leeeeetle bit freaked out that they'll find something funny.

And I'm a bit freaked out that they *won't* find anything too. What am I supposed to "fix" then??

Anyway - just curious if anybody has had one and can tell what's it like.

- signed, tense (We need an emoticon that looks like the tic'y squirrel in Ice Age...)