Fourth Frontier

2:21 marathon PB. 51st place at the London Marathon. 🏃‍♂️

has built his running journey on consistency, resilience, and years of hard work, from racing 800m & 1500m on the track to competing on some of the world’s biggest marathon stages.

With six marathons under his belt, including London, Berlin, and Valencia, Hashi continues to prove that success in endurance sport comes from balancing speed, mileage, and staying healthy through every phase of training.

At Fourth Frontier, this is exactly why we build performance-focused technology — to help runners better understand their training, recovery, readiness, and more, so they can keep showing up, keep improving, and keep chasing breakthrough moments like this.

Because marathon success isn’t just about race day. It’s about the consistency behind it.

Is running in HR zone 3 really that bad? ↓

Zone 3 gets a bad rep. It’s seen as too hard to build endurance, but not hard enough to drive real performance gains.

But it’s also where marathon pace often sits.

So the problem isn’t the zone itself, it’s how you use it.
A lot of runners end up in zone 3 by accident.

Easy runs creep up in effort, fatigue builds, and they don’t even realise it.

That’s where understanding your effort matters.

If you’re training for a marathon and your race pace is in zone 3, then it makes sense to train there intentionally.

But if not, your easy runs should stay easy and your hard sessions should stay hard.

For beginners, don’t stress about zones too much. Focus on effort, stay consistent, and your body will adapt.

Every run should have a purpose, not just effort. Train with clarity using Frontier X2

Learn to run slow, then run fast ↓

A lot of runners struggle with easy runs, and that’s completely normal.
You hear zone 2 is key, but when you actually try it, it can feel too slow to be right.

The truth is, easy runs can’t really be “too easy” unless your form starts breaking down.
If your posture collapses, cadence drops, or you start overstriding, you’ve gone too far.

But until then, it is supposed to feel slow.
That point is different for everyone, so focus on effort.

Keeping your runs around an RPE of 4 to 5 is a good place to start.
Most runners avoid slowing down because it doesn’t feel like “real running”

But in most cases, slowing down is exactly what helps you improve.
When you start paying attention to things like heart rate, recovery, and overall effort, it becomes much easier to stay in the right zone.

Keep your cadence steady, posture relaxed, and don’t be afraid to slow down or take short breaks.

Understand your effort, stay in the right zone, and train smarter with Fourth X2

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