How does the Cheetah's Sprint spell work?

Spoiler: Cheetah's Sprint
If you take a charge or run action before the end of your turn, you can move a total distance of up to 10 times your base land speed. This adjustment is an*enhancement bonus. There is no effect on other modes of movement, such as*burrow, climb, fly, or swim. As with other effects that increase your speed, this spell affects your jumping distance.

It gives an enhancement bonus to.....something? And the value of that bonus is.......presumably a number?

I see this spell come up pretty frequently on 'gotta go fast' builds, but how does it actually work?