Run at medium speed 1000m, then do an accelerated run of 200m, jog 200m, accelerate run of 200m, jog 200m, accelerate run of 200m, and then run at medium speed 1000m (the total * * * is 3000m).
It will be very effective in two weeks.
After reaching 3000m, increase 1000m.
Or 1000 medium speed, 1000 fast+slow, 1000 medium speed, 1000 fast+slow.
Trust me, it's right.