After a warm-up (20 mins of jogging and 3 gradual 15-second accelerations), you're going to run at more or less your max pace for 1 minute, then jog very slowly for 1 minute before starting again, completing a total of 8 repetitions.
Finish the session with a 10-minute warm-down (at no more than 65% of your maximum heart rate) to relax your muscles and gradually lower your pulse.
You'll recover more quickly and your body will cope better with the next session.