What are the causes of a bad run ? I’m sure there are many.
In general, I’d expect these to result from overtraining or poor rest. But I’m not sure it follows, since I’ve had a couple of bad runs following days off and early nights recently. In each case, I felt fine during the morning, but was sluggish, dead-legged and repeatedly tempted to walk when I ran at lunchtime.
Conversely, sometimes I can run surprisingly well on jet-lag or when I have very disrupted sleep. I can feel ragged and near the edge but run fast.
Can being too well rested result in a lack of adrenaline ? It’s a mystery.