Distance Intervals?

So today I made an attempt at some kind of distance interval workout.  Headed out early this morning in order to avoid the majority of the heat!  Did about a half mile warm up.  Then did repeats of loop that is some where around 1000 m I think.  Did this three times and hit them all at just over 4:30.  By the third one i was exhausted and it was humid.  Knew I had a long run home so I called it a day.  Half mile cool down.  Then 2 min abs to finish up the day.  Spent the rest of the day shopping with mom to get ready for my trip, then spent 2 hours with kids at Aerial's, had to coach strength.  Believe me the kids were thrilled!!  Overall a good day!  Can't believe this week is half over!