Do you like targets that get increasingly difficult to achieve? Well, with this one you need to travel (eg, run) the furthest distance you can at an average speed of at least that much! So a number of 20 means that the best you've done is to travel at least 20 miles at 20mph or more.
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Wouldn't it be a lot nicer if there was a calculation on the fastest speed per distance within the total ride. So for example, what I found with looking at the details was that within the ride my max speed over that same distance was 37,7km/h. So In that case I would say my score should be 37,7 and not 36,5.
I don't know how difficult it is to measure. It sure is possible but needs a lot more calculation than when you look at the avg speed over the complete ride.