I spent all of last week waiting for one run to feel good.

That is the promise of a taper. You spend months digging a hole, you stop digging, and your body spends a couple of weeks filling it back in. Somewhere in there you are supposed to get a morning where your legs come back online and you think, there it is, that is what all of it was for. Anybody who has raced anything long knows that run. It is the reward for the boring part.

It never came. Five days out from Grindstone, and my legs are still stiff from my hips down through my quads into my calves, the same as they have been every morning for a week. The head cold that kicked all this off cleared days ago. The legs did not get the memo.

The block started the last week of April. Grindstone is 32.5 miles with about 5,020 feet of climbing, roughly 155 feet of gain for every mile I am out there. I live in Avon Lake, Ohio, a mile from Lake Erie, on terrain so flat that my only honest option for vertical training has been a treadmill set to 12 percent while I stare at a wall in my basement.

This is not my first ultra. I ran a 50k along the Chicago lakefront about fourteen years ago, on ground every bit as flat as the ground I train on now. What I have not done is climb.

So that is the setup. Twenty-one weeks of building toward five thousand feet of vertical, done almost entirely on a course that has none in it. Whether that was enough is a question I get answered on Saturday and not one minute sooner.

And now, with the hard work banked and nothing left to add, the plan says do less. Then less than that.

The logic is not complicated. Fitness is slow to build and slow to lose. Fatigue is fast to build and fast to shed. Cut the volume, keep almost all of the first thing while clearing out most of the second, and show up on race morning a few percent better than you were at the end of your biggest week. That is the whole trick.

I know this. I worked through Jason Koop's Training Essentials for Ultrarunning chapter by chapter this spring and underlined most of it. I could explain the mechanism to you on a whiteboard.

Koop also tells you exactly what the next two weeks will do to your head:

So I was warned. In writing. With a name for it.

None of that has made the last week feel any better, which turns out to be the actual lesson. Knowing why something works does nothing for how it feels while it is working.

Here is last week's log.

Monday. Woke up under the weather. The 7 mile steady state on my plan became 7 miles easy, and my legs were heavy the whole way. I told myself the timing was fine, that a taper is supposed to feel easy anyway. Then I spent the rest of the day worried that I would not shake it, looking at the much lighter week ahead, and wondering if I should be squeezing in extra easy miles to make up for something.

Tuesday. An easy 4 miler that did not feel as easy as it should have. Better than Monday, but I could tell I was not at 100 percent. Monday I could hand to the head cold. Tuesday is where that stopped working, and the doubt moved in behind it.

Wednesday. Tempo day. Ten minute warm up, two eight minute efforts at 6:07 and 6:18 with four minutes between, then a cooldown. Better than the two days before it, and still a long way from good. First day the congestion started to break, too. Somewhere in there my worry had quietly migrated. All I wanted was for one of these taper runs to feel refreshed and strong.

Thursday. Breathing fine by now, cold all but gone. An easy 4 miler the day after a speed session, and I was stiff and sore through the whole thing anyway. I have tapered before. I remember it being easier than this. I remember the legs coming back. Then again, the last time I tapered for something this long I was thirty-one years old and it was 2012. I am not sure that memory is a witness I should be calling.

Friday. Ten miles, done before the house woke up. More of the same.

Five runs, no moment where it clicked.

Here is the part that should have fixed it. Wednesday's numbers were fine. Half sick, sluggish, quietly doubting the entire block, and I still put down two eight minute efforts at the paces I was supposed to hit. The watch said I was exactly where I should be.

It did not help at all.

Which is when I understood what I had actually been asking the taper for. Not rest. Reassurance. And reassurance is not a thing a training plan can give you, because it is not a physical quantity. No amount of banked fitness converts into feeling okay about Saturday.

I should be fair about what I am measuring here, though. By the standards of the last five months, none of that week was much. The tempo was the only hard effort in it and everything else was short. And the cold, for whatever it is worth, broke Wednesday and was all but gone by Thursday. The legs did not follow. Thursday and Friday I was breathing fine and still moving like I had done something much harder than I actually had, which means I cannot hand this to the head cold. That was the explanation I had been saving.

Something always intervenes in a taper. Yours will be a work trip, or a stretch of bad nights, or a kid who brings something home from school, and you will spend the week trying to work out how much of what you feel belongs to the taper and how much belongs to the interruption. I am not sure that question has an answer. I am fairly sure I would have found something to pin it on either way.

The taper did give me something, just not what I ordered.

The runs got shorter, so I slept in, and that mattered more than it should have. The congestion had been wrecking my nights and the extra hour was the only thing patching it. My parents were in town over the holiday weekend and I was around for it instead of out on the road for four hours. Thursday I got home early enough to have coffee alone before anybody else was awake. Friday I was back before sunrise with time to play outside with my son for a few minutes before school.

None of that is the taper working the way the physiology describes. It is the taper working in a way I did not plan for and would not trade.

Twenty-one weeks of discipline, and the only thing that actually kept me on plan last week was a head cold.

That is the honest version. I was worried, on Monday, that the light days would tempt me into adding miles I had not earned. It is the oldest mistake in the taper and I have made it before. But I was too run down to overdo anything, so I did exactly what the plan said, no more. I would like to tell you I resisted. I was spared the choice.

The rest of the plan is set. Shoes, tape, fueling, the vest. All of it decided weeks ago and none of it worth reopening now. The only thing my brain has found to chew on is whether to pack the cold weather kit when the forecast says 80 degrees. That is what taper anxiety does when there is nothing real left to worry about. It finds the one unsettled thing in the pile and moves in.

I also expected to be short with people. Irritable and difficult to live with, per the book, and Koop has coached more of these than I will ever run. I spent the week watching for it and it never showed up. I do not entirely know what to make of that, except that whatever this taper is doing to me, it is doing it inward rather than outward. The tantrum went somewhere quieter.

Here is the thing I have not said out loud until now.

I have hit the wall in a marathon more than once. Most of those were ordinary. You suffer, you slow down, you get it done, you eat something greasy afterward and move on.

One of them was not.

Mile 16, I walked off the course. Not to regroup, not to stretch something out. I was going to walk home and call it a day.

I made it about a half mile before I talked myself out of it. I told myself that I am not a quitter, that it did not matter how long it took, that I was going to finish. Then I walked back to the course and slogged through the last ten miles. They were brutal. I finished.

I have carried that one as a failure for years without examining it too closely, which is something you can get away with right up until you sit down to write it out. Because written out, it is two stories. One is a guy who quit at mile 16. The other is a guy who turned around.

I do not know which one shows up on Saturday.

I wrote the whole race plan out last week, and it holds three versions of Saturday. Six hours on a good day, about 11:05 a mile. Six hours fifteen on a normal one. Six thirty if it turns warm, or my stomach goes, or the climbing takes more than I have got.

Those are not three goals. It is one goal and three sets of conditions, and I will not know which day I am having until I am well into it.

What I notice is that I sat down at a kitchen table and wrote out, in advance, what it looks like when it goes badly. You do not draft a C scenario for something you believe cannot happen to you.

I ended that race plan by saying the thing that decides this race is not a cutoff. Here is what I meant.

I am not afraid of not finishing Grindstone. A DNF is not up to me in the way people pretend it is. Courses and weather and stomachs make their own decisions.

What I am afraid of is hitting that wall again, on a course with five thousand feet of actual climbing in it, and finding out that I am still the guy who walked off at mile 16. I am afraid of not doing my best. I am afraid of missing those three numbers, which are mine, which I chose, and which are the only part of race day that is genuinely in my hands.

It is not a fear about my legs. Which is probably why a week of my legs feeling bad has bothered me as much as it has. I have been going out every morning looking for evidence. Not about my fitness. About whether I am the person who gets through it.

The taper cannot tell me. That is not what it is for.

Five days.

I’ll write what happened either way. Subscribe if you want to know which one showed up.