What is the average speed for a high school fullback?

Football speed is usually measured in the 40 yard dash ( how fast a player can run 40 yards). A typical NFL halfback can run the 40 in about 4.5 seconds. College and high school will average 4.5 to 4.8. A very fast halfback will run between 4.3 and 4.4. A halfback's quickness is just as important as his speed but is harder to measure. Backs like Emmitt Smith and Amp Lee were not very fast but had exceptional quickness.