i can run 2 miles in 20 min, but thats just from me pushing myself. i have this game i play when im running on the elliptical, cuz i can see how many minutes have gone by, and what % ive run, so i try to keep it with the % about the same of the time. unless im trying to get 2 miles in less time. then i aim for the percentage being higher.
1 min = 10% of 1 mile
all the way up to
20 min. = 200% or finish/2 miles
make sense?
thats what helps me.
also, watch your heart rate. you dont want that going up too high, but you dont want it to be too low either.
im sure others are going to find this and give you much better info than i can
best of luck!