I love circuit training with Kate. I'd even dare to say it's FUN. Don't get me wrong...it's hard. Like, the hardest I've ever worked out. But here's the beauty of circuit training: just when you think you can't take anymore, it's time to move on to the next thing! The stations that she creates keep things interesting.
Kate also provides a kind of "tough love". She will NOT let you slack but she's also very supportive and encouraging. I also have significant knee problems and she's able to accomodate me easily.