Post-Gazelle condition

Last night I could feel the muscles in my arms working, but they're not sore today. My legs don't seem to be sore so far, but my hips feel like they got a bit of a workout. My butt is a little worked-feeling too. My stomach is slightly sore - the muscles have that post-workout tension. I slept really well last night though, and I did feel pretty good after my workout.

So... important muscle groups that need toning targeted - check.
areas that need major slimming targeted - check.
extended cardio workout - check.

Should I try to do 5 miles today? I could do two miles early in the day and the other three this evening.

Here's the reason I really like my Gazelle - I get to run without killing my knees and ankles. (It's the bouncing up and down and slamming my weight into the ground on my ankles that really causes me a lot of pain.) I know a lot of people get on one and just walk, but I don't feel like I'm doing any good unless I'm at least jogging. I usually keep my speed between 6.5 and 7 miles per hour, though I've checked to see just how fast I can go, and it's about 8 mph, tops.

I still don't feel guilty about not having worked out on it in about a year. However, I am horrified by what I see in the mirror, and my doctor yesterday said he's concerned about all the weight I've put on in the last 10 years.