Mutants and Masterminds has a "running leap" that's generally twice the distance of a "standing leap". The question I've had is, what does one need to do to take advantage of it? Does one having to take a Move action right before that, possibly in the prior turn? Is the run-up considered part of the leaping distance? How much distance is necessary? This might seem trivial, or something better suited to a Rule 0 ruling of "whatever is most fun", but it keeps showing up in games, and when distance is doubled by a run-up, it can make a huge difference whether a person uses their entire turn to run 5 feet to the edge and jump 16 feet or can simply say "my running jump is 24 feet, so I can do this as a Move action, right? And then use a Standard to disarm the blackguard on the other side?"
Probably, the easiest thing to do is to use the descriptor in other d20 games such as D&D and Pathfinder, as mentioned in the answers below. I'm debating just deleting this question, but there's a chance that someone has an official reference on how to handle this. If not, I'm also willing to accept suggestions on how the other d20 systems handle it.
Best Answer
For other d20-based games, it tends to be clearly and explicitly written in the rules right next to where jumping is described.
D&D 3.5 (and probably other d20) - long jump is done as part of move action, and it requires 20 feet running start (as part of that move action) or the DC is twice as hard. And if you "run out of movement mid-jump" then the move+jump finishes on your next turn's movement. (PHB page 77)
D&D 4 - almost the same, jump is part of the move action, if you move at least 2 squares before the jump, then you jump twice as far, and again "Count the number of squares you jump as part of your move". (PHB page 183)
Both descriptions also seem to allow multiple small jumps in a single move action, as long as the total distance of all movement is within your capabilities.
While neither of these is the M&M rule explicitly, it's probably reasonable to use the D&D 3.5 definition of requiring a 20 foot running start. The doubling of the DC simply doesn't apply since there is no skill check.