Slowly but surely

Went for a run with some of the guys from school. I ran to the session and back as well, but the session was 3 sets of 3 x 6 50m sprints and one last rep on the end. So each rep is 300m long so the in all it was 3km of hard work. 8.6km all up and felt bad afterwards. I have a sore throat now so I probably did too much exercise before I got over my cold so I'll take tomorrow off to hopefully get better.