I stressed about my stress test too. But it turned out to be easy. They put me on a treadmill and over time increased the incline and the speed. But I never got past a fast walk. If you bike or do other exercise with any regularity, you shouldn't have a problem with the stress test. When it ended I was just getting warmed up. The only thing I didn't like about it was getting sweaty.

I hope the test has good results for you.