On the treadmill you can crank the speed up for spurts and put it back down to like 7mph for example.Usain Bolt | Usain bolt, Best body men, Olympic athletes
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Don't jog so much, it will just work your cardio and train you for marathon or long distance run. shorten it up and just do sets of sprints of maybe 100m. when you run, really run like hell. like a gazelle being chased by a tiger. Dig for everything. When you sprint hard, your entire core including abs will get worked, also your lower back to match as you want front and back to be similar strength. I don't know if you can do it on a tread mill, just use the street in front if you can.
What about elliptical machines? Don't those workout your arm muscles and chest? I thought about buying one of those too but the new neighborhood rec room has a couple of them machines now.