Originally Posted by Mr. Flopnuts
Who cares? You can always build speed. Personally, I focused on the endurance first. Now, I'm much, much heavier than you, and was also at the time. I weighed 270 when I was running 8 miles. My first 5k I ran a 12:30 minute mile. By the time I was running 8 miles I cut it down to about 11 minutes. And that was at 270. Focus on the endurance, and challenge the **** out of yourself and the speed will come.
I don't normally advocate taking fitness advice from a 400lbs man, but I have some experience in this.
right now I am doing intervals and I do a little less than 10 minutes per mile for 3 miles. At this point my routine is getting a little bit easy. I'm thinking of either increasing speed and sticking with 30 minutes of cardio or maybe adding 2-4 more intervals into my routine.