What are your thoughts about it if you let your mind go? Are there any events or places in your life that come to mind even if they seem unrelated? Anyone you are worried about? A place you are trying to get to but fear? What do you feel as you First begin to sprint? Is it fear? Initially excitement? Hope? nothing particular?
Are you engaging in any behaviors that are risky to your mental or physical health?
How old are you? Only you can choose the meaning, the reason.
Does anything precede the onset of the dream? (a sound, ...thoughts ---
Might you lose this person in another way? I am curious, this intrigues me as I have had a life full of repetitive, thematic dreams, some nightmarish, some otherwise.
Try writing it down, and Any other dreams you have---see if there is more going on to give you an answer that feels right. Let yourself fall into the dream---it will cause you distress but it will not kill you--- Does it continue if you sleep in different places?