Blog-Jogger.

First circle..Knee a little sore. Why would it hurt? Then I remembered that I am 50 years old.
Well, then that's fine. Second circle..Nearby the guys were playing football. I watched with interest as one of the players athletes moving ran towards the opponent's goal. But here I turned and did not have time to see the end of the attack. But I heard behind me; "Goal!" Well done !.Third circle.The pain in my knee has disappeared is gone in my knee.My breathing became rhythmic and I increased the my speed.
Fourth, fifth, sixth...Drops of sweat appeared on my face as a reward for my work.
Okay, enough for today.

Great!  Remember to leave a space after the use of a full stop.  

P.S.  I wouln't dream of running at my age!