My body seems to do its own thinking and gets VERY used to an exercise fast. SO, I have to shake it up a lot. I will do hills, change speed, walk backwards on the treadmill and RUN. It seems that running is something my body does not adjust to as fast as other exercises, but I am constantly varying the speed up and down as I am hoping to become a faster runner. I like to do elliptical, outside bike, I lift, and I recently started doing the workouts in circuits from JillianMichaels.com. I think they are good. You do five circuits at each workout. Each circuit has two strength moves and then a cardio component. You do it three times and move to the next circuit. I run outside, too for variety when it's warm.

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