Here's something nobody tells you about long rides. The number everyone reads off at the end — average power — is the one that tells you the least about how the ride actually went.
Picture two riders. Same five-hour ride, wheel to wheel the whole way, same average power on both head units at the finish. One of them goes home, eats dinner with his family, sorts his kit, and rolls out the next morning feeling good. The other can barely get up the stairs, spends the night flat on the sofa, and is mentally gone. Same distance. Same watts. Two completely different riders by the time they get home.
So what's the difference? It's a quality called durability, and it shows up in one number most amateur cyclists are never taught to read. Let me break this down and make it really easy for you, because this is one of the most fixable things in your whole training — and getting it right is what "riding faster with less effort" actually means.
Listen to the full solo episode of the Roadman Cycling Podcast →
Average Power Is Lying To You
Average power tells you exactly one thing: the work you produced. It tells you nothing about what that work cost you.
Two riders can post an identical five-hour average and pay completely different prices for it. One holds those watts at a steady heart rate, barely breaking a sweat by his own internal accounting. The other is dragging that same number out of a body that's screaming at him by hour four, heart rate climbing, form falling apart, running on fumes. Same external number. Wildly different internal cost.
That internal cost is the thing that decides your rides. And it has a name.
The Number That Actually Matters
Here's where it gets interesting. The quality I'm describing is durability — your ability to hold power deep into a ride after you've already burned through a load of energy. And the cleanest way to see it is a number sitting right there in TrainingPeaks that most people scroll straight past: aerobic decoupling, shown as Pw:Hr.
What it measures is simple. As a steady ride goes on, does your heart rate stay locked to your power, or does it start drifting upward to hold the same watts? If power and heart rate stay coupled from start to finish, your aerobic system is comfortable. When the heart rate creeps up while the power stays flat, the two are decoupling — and that drift is the sign of a body straining harder and harder to do the exact same job.
The benchmark Joe Friel and the TrainingPeaks coaches settled on is this. On a long aerobic ride, under about 5 percent decoupling means your base is real. Between 5 and 10 percent, it's coming but not locked in. Drift well above that on a genuine aerobic ride and the truth is plain: your base isn't yet built for the duration. You're the rider who's wrecked on the sofa.
This is the number that tells you whether your base is real or whether you've just been counting hours. And here's the good news — once you can see it, you can fix it.
Why Durability Beats Your FTP
Most riders are chasing the wrong number entirely. They obsess over their fresh, fully rested FTP — the watts they can hold for an hour with empty legs and a sharp head on a good day.
But think about it honestly. When was the last event that actually mattered to you decided in that state? Gran fondos, sportives, long road races, big mountain days — they're all won and lost in hour four and hour five, when the legs are heavy and the fuel is low. The rider who wins those isn't the one with the biggest rested FTP. It's the one whose legs are still turning over while everyone else drifts off the back.
That's durability. It separates riders far more than fresh FTP does, and it's the one quality most amateurs never train on purpose. They ride steady all winter, watch the average power tick up, feel like they're working hard, and never once check whether they're actually getting more durable or just stacking up tired hours. Those are not the same thing.
The Three-Part Fix
So you're convinced. The number makes sense. Now the bit you actually care about — how do you build it? Three levers. None of them glamorous. All of them work, and they line up almost exactly with the five golden rules for boosting cycling endurance we went through on the podcast.
Fix one: build the low-intensity volume. This is the unglamorous one everybody wants to skip, and it's the part everything else is built on. The big base of easy, low-intensity aerobic riding — proper zone 2, the pace where you can still hold a conversation — is what builds the aerobic capacity that holds your power deep into a ride, and the cycling base training guide lays out exactly how to structure those weeks. There's no shortcut around it. The riders with the lowest decoupling are almost always the riders who've put in the most patient aerobic time. If your decoupling is high, the honest answer is usually that you need more of these hours before you need anything else.
Fix two: fuel the ride properly. Half the fade you feel in the back end of a long ride isn't fitness — it's an empty tank. When your carbohydrate stores drop, your heart rate drifts, your power follows it down, and you crawl home. Fuelling enough on the bike defends your power in those final hours and keeps the decoupling honest. Most amateurs massively under-fuel long rides and then blame their legs. Get the carbohydrate in, steadily, from early in the ride, and you'll be astonished how much of your "weak finish" was actually just hunger.
Fix three: train durability on purpose. This is the one almost nobody does. You can't only ever practise riding fresh and expect to be strong when tired. So progressively add work to the back end of your long rides — a block of steady tempo or a couple of threshold efforts in the final hour, when you're already cooked. You're teaching your body to produce power in a pre-fatigued state, which is the exact state your events are decided in. Start small, build it gradually, and don't bolt it on until the base from fix one is there to support it.
That's it. Three levers, all of them in your control, all of them startable this week.
What "Faster With Less Effort" Really Means
I want to be really clear about this, because the phrase sounds like a gimmick and it isn't. You're not finding a trick. You're building an aerobic system that does the same job for a smaller bill.
When your base is strong and your fuelling is right, the same power costs you less. Lower heart rate. Less drift. Less damage to recover from. The work genuinely feels easier because, physiologically, it is cheaper. That's the whole thing. Riding faster with less effort isn't about pushing harder or buying something — it's the natural result of a durable aerobic system producing your numbers at a lower cost.
And the beauty of it, especially if you're a rider with a job, a family, and a finite number of hours, is that durability is the highest return on a limited time budget. You don't need more intensity. You need a base that holds, fuel that lasts, and a couple of sessions a month that teach your body to work when it's tired. Get those three right and every ride you do starts costing you less. That's the entire game.
Read Your Own Number This Week
Here's your homework. Go and do a long, steady aerobic ride — at least 90 minutes, ideally longer, held at a genuine zone 2 you could talk through. Then open TrainingPeaks and look at the Pw:Hr decoupling figure. If you're under 5 percent, your base is in good shape and you've earned the right to load on intensity — and the way you split that intensity against your easy hours is the whole subject of the polarised training guide. If you're well above it, you've just found the most fixable thing in your training, and you know exactly which of the three levers to pull first.
If you want the deeper mechanics — exactly how decoupling is calculated and what the percentages mean — I went through all of it in the aerobic decoupling and cardiac drift guide. And if you're a masters rider specifically, the efficiency factor piece is the natural companion to this one.
Bring It Into The Group
This is exactly the kind of thing we work through together in the free Roadman Cycling Skool community — riders sharing their decoupling numbers, their long-ride files, and what's actually moving the needle, with thousands of serious amateurs who care about getting faster the right way. If you've just looked at your own number and want somewhere to figure out what to do about it, come and join us. That's where the real work happens.
Listen To The Full Episode
The full solo episode — the two riders, the number that separates them, and the three-part fix in detail — is on the Roadman Cycling Podcast. For more on building the aerobic base, the conversation on Team Bora's endurance blueprint with John Wakefield shows how the pros do exactly this at the top level, and the episode on how Team Bora actually approach building endurance goes inside their day-to-day method.