Idon’t know how to write a decent, high level story opening in first person, about a man running. plz me it’s in for friday

Hi :)
That sounds like a really fun assignment!!!
So, what I️ would do is get out your thesaurus and go into a free website called grammarly.com. Super helpful!
Start off with with maybe some inner thoughts. Why is the man running? What would you be thinking? Try to personalize it. That will make it more enjoyable for the reader.
Get creative with the language. Don’t get too descriptive with the background or the setting. Yes, those things are important but if you’re not careful it can often drag the reader’s attention away from what the main focus is and bore them.
Hope this helped a little bit :)
Good luck!