Homer J Simpson said:
Did 3 miles on the treadmill at the Y today. 90% of it was walking, but would run or adjust the speed to keep my heartrate over 150 and sweating like a whore in church.
3.5 MPH at a 3% incline is a pretty good workout for a fat out-of-shape ******* like myself.
I'm not sure if you're looking for running advice, but....
I've always been a "lifting" person and never a "cardio" person. I hate hate hate cardio/running. But a 3 min on/1 min off training method has been easily the best cardio plan for me. Obviously you need to adjust the numbers to whatever fits your needs (I'm not in terrible shape, but I'm pathetic compare to a runner) -- and maybe you need to work up to this if you're mostly walking now -- but keep this in mind for the future.
Basically, I can run for 10-15 minutes at 6.5 MPH. What I used to do was run for 10-15 minutes at 6.5 MPH, feel miserable the entire 10-15 minutes, feel like I was going to die at the end, and then finish. I hated the whole thing.
Now, I'll run for 3 minutes at 6.5, then walk for 1 minute at 3.0, then run for 3 minutes at 6.5, walk for 1, etc. Do that 5 times. Or six times. Or ten times. Once you're good at that, go to 3 minutes at 7.0, 1 minute at 3.0 5 times, 6 times, etc. Once you're up to 10, then do 4 minutes at 6.5, 1 minute at 3.0, and so on. It's really easy to make steady progress, although I got up to something good and then quit for 6 months.
I don't know how "good" this workout plan is, but I like it for three reasons.
1) It's actually doable.
2) I don't feel like hell the entire time.
3) I still get a really good sweat/feel like I had a good run without the death feeling.
Obviously you adjust this for your fitness level, but the 3 min on, 1 min walk thing has been a huge improvement for me. If you're in worse shape than I was, just do 2 mins on, 1 min off. But I think this is something that's easy to "stick with" since I don't feel all that terrible afterwards (but am still getting a good workout in).