6 x 400m run on 1:1 intervals (rest as long as your previous run).
Result (with proof):
This was fun. Takes me back to my swim training days (I love interval training).
The first run I didn’t go all out, but I didn’t think I was loafing one bit. I started feeling better and better. The middle two runs were easier and quicker than the first two runs. I was only going to do 5 runs, but I wanted to see if I could continue to negative split just one more.
I made it.