Set treadmill at 12% grade at 0-30 sec slower pace per mile than best 5k pace. Do not reduce the speed!

20:10 x 8

With yesterday's new PR for a 5k, my minimum pace to consider this rx'd became 6:50. I was only able to get through the first 4 rounds before having to slow down. I wound up back at 7:41. Next time...