Hey Lois! Mixing up the cardio is one of my trickiest fitness challenges, too. I do run, as well as kickboxing, step, and hi/lo. I'm not crazy about hi/lo, but I mix it up with those awesome boot camp intervals from the terminator dvd, and it really does get my heart rate up. I have taken a spin class, too, and would love to get a bike and spin workout for home! I'd love to see what others suggest.
Kerrie
oh, yeah, now that summer's here, swimming is one of the best cardio workouts around, IMO!