Another Personal Best on Striling Loop

I have been adding interval training into my training schedule. Started with 400mx4 with 3.5mins break in between and currently at 400mx7 with 2 mins break in between. I try to keep my 400m pace to be 5 mins/km (i.e. 2:00 for the 400m). With the interval training, I am slowly improve my 3.2km time. The latest one is avg 11.2 km/h. It is getting close to my interval training pace of 12 km/h.