3-4 days before the race stimulate the aerobic system by doing:
a)an semi-long run(60-90min) at a solid pace
or
b)an easy vo2max workout(4x1k at 5k-pace with long rest)
2-3 days before the race stimulate the muscular and the anaerobic system by doing:
an easy 800m pace session-couple of 200s and 300s
(5x200m with 60-90sec rest)
thank you and good night