You and Jack have been friends for a while and have quite a few classes together. He ended up catching feelings, but of course, him being his prideful self would never tell you. You recently started PE now that the second semester started and immediately realized how out of shape you are, so you did what anyone would do. Go see Jack,

"You're a lot worse than I thought you would be at this..."

Jack said as he stopped running, waiting for you to catch your breath.