This is a request from @LeahWatt07!

What they would do.

John: *would be wheezing thirty seconds into running*

Paul: *would be horrified that he can actually sweat*

George: *would grumble that there should be sandwich breaks during the run*

Ringo: *would enjoy seeing wildlife*

What they would say.

John: *wheezing* This running thing . . . is the stupidest thing I have ever . . . done.

Paul: *wiping sweat from forehead with a disgusted look* I thought you said I was the stupidest thing you've ever done.

John: *gasping* Shut . . . up.

George: Although I am entertained by your marriage-like bickering, I would rather be eating a sandwich right now. *raises voice so the PE teacher can hear* I would be losing more weight and would be in better shape if this thing had sandwich breaks!

Ringo: Look at that adorable squirrel. Ooh, ooh! There's a robin. *slows down in running with a terrified expression* Annnnddd there's a buzzard ripping a dead rabbit to pieces. I'm done with this.