5 X 150 meters hitting mid 20.x" for all. Rest intervals of 3:00. These would be called "speed endurance" for a 200 meter runner and run at 95%-100% effort (speed) with relatively short recoveries (endurance). Earlier this summer I was hitting these in high 18's, low 19's on a rubber track so I'm pretty happy with the session today. Legs were definitely fatigued but firing.
A few pics. The dirt was really soft which I like. It's slower but I think the added cushion is beneficial for training.