Why You're Not Getting Faster — Total Endurance Performance Guide

Total Endurance — Performance Guide

Why You're Not Getting Faster

The physiological explanation for why training hard isn't enough — and what your body actually needs to improve.

What if the reason you're not improving has nothing to do with how hard you're training?

Most athletes assume the answer to every plateau is the same: train more, train harder, push through.

So that's what they do. More sessions. More intervals. More miles. More effort.

And for a while, it works. Then it doesn't. Times stop moving. Sessions that should be manageable aren't. Race day doesn't reflect the training. And the harder they push, the more stuck they feel.

Here's what nobody tells you: effort is not the limiting factor for most athletes. Understanding is.

Your body doesn't respond to how hard you work. It responds to the right stimulus at the right intensity at the right time. And if that stimulus doesn't match what your physiology actually needs right now — you don't get fitter. You just get more tired.

The frustrating part? You can't feel the difference between training that's building you and training that's just wearing you down. They feel identical. Both hurt. Both feel like work. But only one is actually moving you forward.

This guide explains why. Not in textbook physiology or generic training advice — but in plain language that makes your own training history suddenly make sense.

By the end of it you'll understand why you blow up on rep three of sessions you should be able to handle. Why your race times don't reflect your training. Why your training partner responds to sessions you don't — and vice versa. And exactly what your body actually needs to start moving forward.

Not "how hard am I training?" — but "am I training the right way for my physiology?"

01

The Problem

Why You Train Hard But Nothing Changes

You're putting in the work. Early mornings. Sessions you execute perfectly. Intervals hit exactly as prescribed. You're disciplined. You're consistent. And yet, something's not right.

On race day, you hit the wall. You fade. You finish knowing you left something on the course — knowing that with everything you've trained, you should have gone faster.

But it's not just race day. Even in training, sessions that should be manageable are brutal. You're doing threshold work that should feel hard but doable — and you blow up after rep two or three. A session designed for your fitness level completely breaks you. So you assume you just need to toughen up. Push harder. Handle the pain better.

But here's the thing: that's not a mental problem. That's a physiology problem.

Your body doesn't care how hard you feel like you're working. It only responds to the right stimulus at the right time. And if the stimulus doesn't match what your physiology can actually handle, you don't get tougher. You just get more tired and more frustrated.

Most athletes train the same way regardless of what their body actually needs. They follow generic training plans. They hit percentages calculated for someone else. They do sessions that feel right or that they read online. And when those sessions don't work, they assume they're not tough enough.

But toughness isn't the problem. Understanding is.

The gap between training hard and training smart is knowing what your body actually needs — and why it's struggling when it does.

02

The Questions You Should Be Able To Answer

The Questions You Can't Answer (But Should Be Able To)

You're following a training plan. The sessions look solid. But when you execute them, something doesn't work. So you ask yourself why. And you realise — you actually don't have a good answer.

Why did you blow up on rep three of that threshold session when it was supposed to be sustainable? The real question is: was your threshold set correctly for you? Or is something else limiting how much lactate your body can handle?

Why can your training partner run for two hours with no fuel while you're bonking at 90 minutes? The real question is: how does your body use fuel? Are you efficient at burning fat, or are you dependent on carbs? And how would you even know?

Why does everyone online say the 4x4 Norwegian VO2 Max session is the best workout you can do — but when you try it, you destroy yourself? The question you should be asking: what type of athlete is this session actually designed for? And are you that athlete?

How long should your long run or ride actually be? Not according to some generic plan, but for you. What pace? What's realistic for your body to handle week after week without breaking down?

Here's the pattern: you're training blind. You don't know if the sessions you're doing are right for your physiology. You don't know if the intensity is correct. So you adjust on feel, follow what you read online, or just push harder and hope it works.

But you're not the problem. The problem is you're training without understanding what your body actually needs. You're following a map designed for someone else and wondering why you keep getting lost.

The good news: every one of these questions has an answer. It's locked inside your physiology. And once you unlock it, everything makes sense.

03

Your Athlete Type

You Wouldn't Train a Husky Like a Greyhound

Here's something obvious: you wouldn't train a husky the same way you'd train a greyhound. A husky is built for long, steady work. A greyhound is built for speed and short explosive efforts. Ask it to do zone 2 for hours and it's miserable and unproductive.

They're different animals. Different physiology. Different strengths. Different needs. Yet this is exactly what happens in endurance training. Everyone gets the same generic training plan. The same zone percentages. The same session templates.

But you're not the same dog.

Built for endurance
Husky
Naturally built for aerobic endurance. Long steady work is your sweet spot. Your challenge: low ceiling for power and speed.
Most common type
Border Collie
The generalist. Moderate at endurance, moderate at speed. The most trainable profile with the right direction.
Built for speed
Greyhound
Naturally explosive. Short hard efforts feel good. Zone 2 bores you. Your challenge: aerobic base needs development.
Dog type athlete spectrum A spectrum from Alaskan Husky through to Whippet showing how VO2 max and VLA max combine to create different athlete types. THE ATHLETE TYPE SPECTRUM ← High VO2 max / Low VLA max · · · · · · · · · · · · · · · · · · Low VO2 max / High VLA max → ALASKAN HUSKY Ultra endurance VO2: Very High VLA: Very Low Goes forever. No explosive power. Zone 2 is home. GERMAN SHEPHERD Strong all-rounder VO2: High VLA: High Power and endurance. Performs across all distances. BORDER COLLIE Most common type VO2: Moderate VLA: Moderate Adaptable. Responds to all training types. Needs direction. GREYHOUND Speed athlete VO2: Low VLA: High Fast over short. Fades quickly. Needs aerobic base. WHIPPET Pure explosive VO2: Very Low VLA: Very High Explosive power. No aerobic base. High potential. WHY THIS MATTERS FOR YOUR TRAINING The 4x4 Norwegian VO2 max session is built for the left side of this spectrum — high VO2 max, slow oxygen kinetics. If you're a Greyhound or a Whippet, that session will destroy you every time — not because you're unfit, but because it's the wrong stimulus for your physiology. There are 25 athlete types in total — these are just five anchor points on the full spectrum. Take the quiz at total-endurance.co.uk/dog-quiz to find your exact type →

Some of you are huskies. Long steady work is where you thrive. You can run for hours. The problem: you might have a low ceiling for power and speed. Pure zone 2 might not be enough to get you faster.

Some of you are greyhounds. You're naturally explosive. Short, hard efforts feel good. But aerobic endurance doesn't come naturally. What you actually need is tempo work, sweet spot intervals — training that builds the aerobic base you're missing.

Most of you are border collies. Moderate at endurance, moderate at speed, moderate at power. Good at adapting. The problem: without the right focus, you end up mediocre at everything instead of strong at something.

The point: your training should match your physiology, not someone else's. And that requires knowing what dog you actually are.

Find Your Type

Take the Total Endurance Dog Matrix Quiz — 8 questions, 3 minutes, 25 athlete types. Find out which dog you are and what training approach actually matches your body. Take the quiz →

04

The Physiology

The Physiology Behind Your Dog Type

Your body has multiple systems working together. Depending on how those systems are wired, you end up as a Husky, a Greyhound, a Border Collie, or something in between. Understanding these systems is the difference between training blind and training with purpose.

The Engine
Your VO2 Max
Think of your aerobic system like the size of your engine. The bigger your engine, the more oxygen your body can use, the more work you can do aerobically. Huskies typically have a large engine — they can sustain high aerobic output for hours. Greyhounds often have a smaller aerobic engine relative to their power output. But engine size alone doesn't determine performance — it's how the whole system works together.
The Factory
Your Lactate Production (VLA Max)
Your body produces lactate when you work hard. Think of it like a factory. Some people's factories are massive — they churn out huge amounts of lactate very quickly. That's high VLA max — great for explosive efforts. Others have smaller factories that produce lactate more slowly — low VLA max — which means they can sustain lower efforts for much longer without accumulating fatigue.
The lactate factory system How lactate is produced in the muscle, transported into the blood, and used by the aerobic system. THE LACTATE FACTORY — WHAT IS HAPPENING INSIDE YOUR MUSCLES MUSCLE (workshop floor) ⚙️ ⚙️ ⚙️ Workers producing lactate (VLA max) High VLA max = big workforce Low VLA max = small workforce MCT4 floor movers Moving lactate from muscle into blood ⚠ bottleneck = blow up on rep 3 Standard tests miss this. INSCYD kinetics reveals it. BLOODSTREAM (dispatch room) Lactate in transit via MCT1 transporters to aerobic system AEROBIC SYSTEM (mitochondria) Burns lactate as fuel lactate MCT1 WHAT HAPPENS WHEN MCT4 IS THE BOTTLENECK Workers churning out lactate faster than ever MCT4 overloaded can't clear fast enough lactate backs up in muscle Fatigue spikes effort feels impossible you blow up 💥 This is why you blow up on rep 3. It is not mental — it is logistics. Standard lactate tests miss the kinetics. INSCYD reveals exactly where your factory is jamming. Two athletes with the same threshold can have completely different limiters — and need completely different training.
The Full System
The Lactate Factory
Imagine your body is a factory. Workers produce lactate. Floor movers transport it out of the muscle into the blood. Dispatch staff get it into the bloodstream. Delivery vans take it to where it can be used as fuel by your aerobic system. When any part of the chain backs up — performance suffers. This is often what's happening when you blow up on rep three. It's not mental. It's logistics.
Workshop workers = VLA max / glycolytic system
Floor movers = MCT4 transporters
Dispatch room = bloodstream
Dispatch staff = MCT1 transporters
Delivery vans = aerobic system / mitochondria
The Fuel Tank
Fat vs Carbohydrate
Your body fuels itself with fat and carbohydrates. Fat is almost limitless but only accessible at certain intensities if your body is trained to use it. Carbohydrate is fast and powerful but limited — roughly 90 minutes of supply at moderate intensity. If you're bonking at 90 minutes while your training partner runs for hours unfuelled, you're probably carb-dependent. This isn't a weakness. It's information. And once you know it, you can train it.
The Key Insight
"Different athletes have different limiters — and they can't feel the difference. Two athletes can have the same threshold pace. One is limited by VLA max. One by lactate transport. Both blow up at the same point. But they need completely different training to improve."
05

Your Threshold

Your Threshold Isn't What You Think It Is

Here's a common frustration: you do an FTP test, get a number, and set your training zones based on that. But when you try to sustain that power or pace for an hour, you blow up well before 60 minutes. So you think your test was wrong. Or you're not fit enough. Or you need to push harder.

But here's what's actually happening: your threshold isn't just a number. It's a balance point.

The bathtub threshold diagram VLA max is the tap filling a bathtub, VO2 max is the drain emptying it. Threshold is where they balance. THE BATHTUB — HOW THRESHOLD ACTUALLY WORKS At threshold — balanced threshold VLA max (tap) VO2 max (drain) water level stable tap = drain = threshold Above threshold — overflowing threshold VLA max (bigger tap) VO2 max (same drain) lactate accumulates fatigue spikes — you blow up Training can enlarge the drain (VO2 max work), reduce the tap (VLA max work), or both — depending on your specific limiter.
The Bathtub
How Threshold Actually Works
Imagine your body is a bathtub. Your lactate production (VLA max) is the tap filling it. Your aerobic system (VO2 max) is the drain emptying it. When you're going easy, the tap trickles and the drain keeps up — the water level stays low. When you work harder, the tap opens up. More water flows in. As long as the drain keeps up, the water level stays balanced.

But there's a point where the tap opens so much that the drain can't keep up. Water starts accumulating. The tub fills. That's when fatigue spikes and you can't sustain the effort.

That point — where the tap and drain are perfectly balanced — is your threshold. Not an arbitrary percentage. A real physiological balance point specific to you.

A Husky has a slow tap and a large drain. They can sustain efforts for a long time before the tub fills. A Greyhound has a fast tap and a smaller drain. They hit their limit faster. Same threshold number on paper. Completely different physiology underneath.

This is why generic training zones fail. Most plans use percentages — do 85-95% of FTP for threshold work. But that assumes everyone's bathtub fills at the same rate. It doesn't.

You can train your drain to be bigger. You can train your tap to open more efficiently. You can train how much water the tub can hold before fatigue sets in. But the key is knowing which of these needs to change for you — and at what specific intensity that change happens.

"Most testing gives you a number. At Total Endurance we want to give you understanding. Not just what your threshold is — but why it's there, what's limiting it, and exactly what you need to train to change it."

Total Endurance — Aberdeen, Scotland
06

Your Performance Explained

How Your Physiology Explains Your Performance

You've already seen this play out in your own training and racing. You just didn't have the language to explain it.

The pace drop across distances. If you're a Husky, your paces stay relatively close across distances — your 5K, 10K, half marathon, marathon don't drop off dramatically. If you're a Greyhound, your paces drop significantly as distances get longer. Strong 5K. Noticeably slower 10K. This isn't a fitness problem. It's a physiology pattern.

The swimming example. Two swimmers complete 800m in the same time. One gets there by sustaining a steady, efficient aerobic pace — they could swim another 400m at almost the same pace. The other gets there by going harder, accumulating more lactate per length. By the end they're spent. Same time. Completely different physiology. Completely different training prescription.

The fuel wall. There's a duration where you hit a wall unless you fuel. Your training partner doesn't seem to have that wall. They're not fitter. They're wired differently. Their body is more efficient at burning fat. Yours hasn't been trained to do the same — yet.

Every performance outcome you've experienced has a physiological explanation. Once you understand your actual physiology, it all makes sense. The session that destroyed you. The race where you faded. The distance where you always hit a wall. Now you understand the mechanism. Now you can address it.

The Transformation
"When athletes see their results — the why behind their threshold, the specific mechanism limiting them — they don't just get numbers. They get an explanation for everything that's already happened in their training and racing. It all makes sense."
07

Your Next Step

From Understanding to Action

You now understand something most endurance athletes never do: your physiology is individual, and your training needs to match it. But understanding isn't enough. What do you actually do with this knowledge?

What testing actually reveals. When you get tested at Total Endurance, we're not just measuring your VO2 max or your threshold. We're answering the specific questions you couldn't answer in section two. Why do you blow up on rep three? Why can your training partner run unfuelled for hours while you hit a wall? Where is your real limiter — your engine, your factory, your fuel? Testing reveals these answers. Not estimates. Not percentages calculated for someone else. Your actual physiology.

What changes after testing. You see patterns that explain your performance history. Your pace drops. Your race outcomes. Your training struggles. It all makes sense. More importantly, you get specific direction — the exact intensity that produces your best adaptation, the specific session type that targets your specific limiter, and how to measure in training whether it's actually working.

The path forward. Some athletes take the data and implement it themselves. Others need help making it consistent — that's where coaching comes in. But it starts in the same place for everyone: your physiology, your data, your specific prescription.

Ready to Start?

Stop Guessing.
Start Training With Data.

The most important thing you can do for your training is understand your physiology. Everything else follows from that.

Not sure where to start? The free consultation is a 15-minute call with our coaching team. Tell us about your training and goals — we'll tell you honestly whether testing is the right next step for you.