4 x 1/2 mile easy/3 x 1 mile hard intervals

Lisie and I did 5 miles of intervals consisting of 4 x 1/2 mile easy and 3 x 1 mile hard at Silver Lake this morning. The three 1 mile intervals were 9:12/9:12/9:00 (Lisie) and 9:10/9:12/9:05 (me). Both of us did the total 5 miles in 50:00 ( 10:00) ppm. We both agreed it was a tough workout.