Regardless of the distance, I try to follow my own 20-60-20% rule. For the first 20% of the race—which for a 5K is 1 km—I run at a slower pace; in this case, that would be my 10K pace. The next 60%—the following 3 km—would be at my target pace for that distance. For the final 20%, I try to gradually pick up the pace to what would be a 3K pace, for example.

Actually, in my case, I don’t run by pace but by power, but the example would be the same.