Old faithful: 8 x 400m with 200m recovery intervals. The usual route.
I gotta tell you, I’m pretty happy with those splits. Obviously I’m nowhere near where I need to be eventually. But considering I’m only in a low/moderate intensity run training phase, the fact that I was at a 6:45 – 7:30 pace without totally blowing out a lung (including a 7:07 final interval!) is good enough for me.