Have you ever been out on a run and felt like you just… couldn’t push any harder?

Not because you weren’t trying — but because your body just wouldn’t go.

Maybe your legs felt heavy, even though your breathing was fine…

Or maybe your lungs were working overtime, but your legs still had more to give…

Or you hit a certain pace, and no matter what you did, it felt like your body had a built-in speed limit.

That’s called your limiter.

It’s the part of your system that breaks down first — the weakest link in your performance chain.

And until you address it, you’ll always feel stuck.

This is often called the theory of constraints.

You see, every system is only as strong as its weakest link — and when it comes to running, that one weak link can cap your progress no matter how strong everything else is.

For most runners, the limiter is one of these six things:

1. VO2 max – the size of your aerobic engine
2. Lactate threshold – how fast you can go before burning out
3. Running economy – how much energy you burn at any given pace
4. Neuromuscular power – how efficiently you generate force
5. Durability & strength – how well your form and output hold up over time
6. Mental focus & pacing strategy – how well you execute under pressure

Find your limiter — and you’ll know exactly what to train to finally unlock that next level of speed.

Run smart,
Nicklas

P.S. I’ve got a new video coming out this week that breaks down exactly how to identify and train your limiter. Keep an eye out for it on the channel.

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Disclaimers: Nicklas Røssner is not a doctor or a medical professional. Always consult a physician before starting any exercise program. Use of this information is strictly at your own risk. Nicklas Røssner will not assume any liability for direct or indirect losses or damages that may result from the use of information contained in this email including but not limited to economic loss, injury, illness or death