Ok so this week i will run four times as i have been doing. Currently the furthest distance i can run is about 2 miles at a decent jogging pace. But while i want to gradually increase the distances for a while i also want to improve my speed. For instance running 2 miles 4 times this week would improve the distance i'm running rather than the speed. So do you think running 1.5 mile quickly just once this week will improve my speed or is it too early?