4.4 miles total (treadmill) at easy pace of 9:40, 4x100 yd sprints at 8 mph/7:30 pace, 1 1/10 mi sprint at 9 mph/6:40 pace. Tired before starting but OK, sprints were really easy. Sore bi-lateral tib. anterior.
Philosophical training question: How tired do you have to be to skip a workout? Should you always just do it? There's got to be one point where you know it would be at least OK, and another where you feel like exercise would push fatigue into illness.