4.3 km run on a shady day

I went for another 4.3km run today despite the poor running timing yesterday.
I was very very serious for the run and I went all out.
Luckily I managed to clock 21:09min for today. I think i can still run faster as my heart can still take some more pounding....

AAR
- I guessed yesterday poor timing was due to poor physical form.
- managed to achieve a much faster timing due to the shady day and weekend traffic-less road.