What Is Tapering in Running?

You've been training for weeks. Maybe months. The mileage has been building, the workouts have been getting harder, and your body has adapted to the routine of consistent high-volume training. Then, two to three weeks before race day, your plan tells you to run less.

A lot less.

This is the taper. And it's one of the hardest parts of race preparation, not because it's physically demanding, but because everything about it feels wrong.

What tapering actually is

Tapering is a planned, systematic reduction in training volume in the final weeks before a race. The goal is to let your body fully recover from the accumulated fatigue of training so that you arrive at the start line fresh, rested, and at peak fitness.

The key word is volume. You reduce how much you run, but you maintain the intensity of your workouts. Easy runs get shorter. Long runs get significantly shorter. But your tempo runs and intervals stay at the same pace, you just do fewer of them.

This distinction matters. The fitness you've built is maintained by intensity, not volume. Cutting volume removes fatigue. Maintaining intensity keeps your neuromuscular system sharp. The combination is what produces the taper effect, that feeling of being simultaneously rested and fast.

How long your taper should be

For a 5K or 10K, seven to ten days is enough. These distances don't require the same training volume, so the taper is shorter. A week of reduced running with a rest day or two before the race is sufficient.

For a half marathon, ten to fourteen days. Two weeks of gradually decreasing volume, with the biggest reduction in the final week. Your last long run should be two to three weeks before race day and shorter than your peak long run.

For a marathon, two to three weeks. The marathon taper is the longest because the training volume is highest and the accumulated fatigue is deepest. Your last long run of 18 to 22 miles should be three weeks before race day. The following two weeks should see volume drop by 20 to 30 percent the first week and 40 to 60 percent the final week.

Why it feels terrible

Here's what nobody warns you about. The taper makes you feel worse before it makes you feel better. And the psychological discomfort is often harder than the physical.

Phantom pains appear. Once your body isn't distracted by the daily fatigue of training, you start noticing every little ache and tightness. That knee twinge you never felt during 50-mile weeks suddenly feels like a crisis. Most of the time these are minor pre-existing issues that were masked by training. They're not new injuries. They're not a sign that something is wrong.

You feel sluggish, not fresh. The first week of taper often feels like you're moving through mud. Your legs feel heavy. Your pace feels off. This is normal. Your body is redistributing resources, repairing muscle damage, topping off glycogen stores, reducing inflammation. The freshness comes later, often in the final three to five days before the race.

You get anxious. You're running less but thinking about the race more. The extra time that used to be filled with training is now filled with doubt. Am I losing fitness? Should I be running more? Did I do enough? This is universal. Every runner goes through it. The anxiety is not a signal that you undertrained. It's a signal that you care.

You might gain a little weight. A small amount of weight gain during taper is common and actually desirable. Your muscles are storing glycogen, and glycogen holds water. That extra pound or two is fuel, not fat. It's exactly what you want heading into race day.

The mistakes runners make during taper

Cutting the taper short is the most common error. A runner feels anxious about losing fitness and adds a hard workout or a long run in the final week. This doesn't add fitness. It takes weeks to build fitness and you can't cram it. What it does add is fatigue that hasn't cleared by race day.

Adding intensity they haven't done in training. Some runners decide the taper is a good time to test their race pace with an all-out effort. It's not. Your taper runs at intensity should be familiar workouts at familiar paces, just with less volume. Save the all-out effort for race day.

Cutting too much too soon. Going from 50 miles one week to 15 the next is too drastic. A 20 to 30 percent reduction in the first taper week, then another 30 to 40 percent the next, is a smoother and more effective transition.

Changing everything else. The taper is not the time to overhaul your sleep schedule, try a new diet, start stretching routines you've never done, or take up yoga. Keep your life as normal as possible. The taper should change your running volume and nothing else.

The evidence that it works

Tapering isn't just traditional wisdom. The research is strong. Studies consistently show that a proper taper improves race performance by 2 to 3 percent on average, with some runners seeing gains up to 5 to 6 percent. For a four-hour marathoner, 3 percent is over seven minutes. For a two-hour half marathoner, it's nearly four minutes.

Those are free minutes. You don't earn them with more training. You earn them by respecting the recovery process.

Trust the work you've done

The taper is an act of faith. You've done the training. The fitness is in your body. The final weeks aren't about building more. They're about letting everything you've built come to the surface.

Milo makes this easier to trust because you can actually watch it happen in real time through your TSB, your training stress balance.

During a marathon build your TSB will typically sit in negative territory, sometimes significantly. A TSB of -10 to -20 during peak training weeks is normal and expected. It means the training is working. You're pushing your body hard enough to create adaptation, and the fatigue is the evidence of that work.

Then the taper starts and you watch the number climb. From -20 to -15. Then -10. Then -5. Then into positive territory. That progression is your body recovering in real time. By race day you want to be somewhere in the fresh to peak form range, ideally between +5 and +15. High enough that fatigue has cleared, but not so high that your legs have gone stale from too much rest.

This gives you something most runners have never had during a taper: actual visibility into whether it's working. Instead of just feeling anxious and hoping the process is doing what it's supposed to, you can see your body recovering day by day.

And if your TSB isn't climbing the way it should be, that's useful information too. Maybe you're not reducing volume enough. Maybe poor sleep is keeping your fatigue elevated. Maybe life stress is slowing your recovery. The number doesn't lie, and it gives you something concrete to respond to rather than just gut feel.

Do less. Feel weird about it. Watch the number climb. Race faster.