Dreams may be temporary flights into madness that, by some law of neurophysiology unclear to us, keep us from actual madness. So, too, the twin activities of running and writing keep the writer reasonably sane and with the hope, however illusory and temporary, of control.
In a short exposition on writing, she ends up writing more about running. Then, ends with the above lines. Hope of control is how she describes the act of running.
On many days, running seems to be a necessary act. An act of anchoring an otherwise formless day into which one was set adrift.