A 5km race is a short race, compared to say a marathon. And the shorter the race, the faster the pace – unless you plan to just run leisurely to complete it. If you want to improve your time, then you have to do speedwork, says running coach Andrew Cheong of SSTAR.fitness.
Speedwork involves running a short distance of 200m to 800m repeatedly up to 10 or more times on a track with a fixed, short period of rest in between sets. Adding speedwork into your training improves your ability to run faster over a sustained period.