Debating "You'll never regret a run"

Today's run (treadmill): 25 minutes

I often quote the line, "You'll never regret a run" to make the point that the effort to exercise is always worth it despite how you might feel. Just this morning my wife said the same thing to me about her workout. Ironically enough, I may have found the exception to the rule today, having completed a treadmill run and suffering the consequences of that decision.

It's hard to differentiate between feeling tired because you've just woken up and feeling fatigued for other reasons. This morning I went through my routine of preparing for the treadmill (30° outside temps made that an easy decision). Though I felt groggy, I expected that feeling to pass once I got going. That happened, but soon after I'd cooled down I was ready to return to bed for more sleep.

Since my schedule is tight on weekday mornings, I had to ignore the dizziness and feeling of weakness. I left for the train, hoping that I could get a decent seat and take a nap. The LIRR is running less trains due to Sandy-related issues and the cars get very crowded, but I managed to secure a good spot and slept for 20 minutes.

I'd hoped that would solve the problem but my fatigue continues. Despite some strong coffee and analgesics I'm still hurting. I don't know if running on the treadmill was best thing for me this morning. Had I not done that, I could have taken an extra 30 minutes to rest and avoided the physical impact of running. If I skipped my run, I'm wondering whether I'd be feeling any better. Or would I feel worse due to the guilt of missing a workout? I'm taking solace in the thought that while I may regret today's run, I would definitely have regretted skipping it.