Notes
3 easy, 4 x 400 (400 + full recoveries), 1 easy. Pace for the first three 400s was 6:00/mi., then the fourth was 5:52/mi. Worked fine on the treadmill. Some discomfort later that day in groin area, but that may have been from standing all day too. So I took the following day off.
Training Plan Entry
repetition
6 mi
PM - 4 x 400 (full recovery). Or fartlek.