Walking on an incline is better than running, coming from someone that does both. If you are training for a marathon, then you must run. But if you are seeking just to cross-train, walk on the highest incline you can at the highest comfortable speed(without gasping for air). It will tone up your legs much more and give you the same, if not better, cardio workout with much less impact and stress on your joints.
Carbs are not bad, especially is your are exercising aerobically relatively frequently. Try to eat clean..cut out the refined sugar, but go ahead and eat the whole grains, fruits and veggies. This whole carb thing really is not of any concern to the average to advanced exerciser not wanting to compete in any fitness competions. I used to live on pasta and white and brown rice and was very lean. Of course, I exercised alot. Well, I got older and got a desk job and decided..no, that pasta and rice was BAD and if I ate it I would get FAT, so I cut it out completely. Ate more veggies. Nothing really happened. So, when I upped my cardio recently, I wanted to eat higher carbs the nights before I ran, so for the hell of it, I threw in pasta on those nights.
All I noticed was greater energy in the AM and i have not gained weight. Of course, if I ate the pasta with my dinner, I did not eat my after dinner snack. So it is all about balance..and eat what you like!! Just don't eat too much of it!! Take Care..Janice