[Anaraxes]

The Concentrate version is for standing jumps. Running starts are of course for running jumps. Both the High Jump and Broad Jump sections that lead the Jumping section make this distinction in their heights/distance formulas. The Jumping During Combat section later introduces the rule to skip the Concentrate at the cost of halving the distance, but of course that only applies when the crouch is relevant to start with -- that is, when you're doing a standing jump.

The text isn't written to be read, understood, and applied in any random sentence order. Start at the beginning and read the page, and the context seems to make it fairly straightforward.