I run ultras because I want to understand my limits.

Not only how far I can run, how fast I can move, or how much climbing I can handle, but how I respond when things become uncomfortable, uncertain and difficult.

That is what attracts me to ultra-running.

Over a long enough race, everything gets stripped back, fatigue builds, the weather changes, nutrition becomes harder, your legs hurt, your pace drops, doubt appears, the plan that looked perfect on paper may suddenly stop working and that is where the interesting part begins.

An ultra forces you to deal with what is in front of you rather than what you hoped would happen. You have to make decisions when you are tired. You have to stay patient when progress feels painfully slow. You have to control the temptation to chase time too early, manage problems before they become serious and keep moving when motivation comes and goes.

For me, that makes every ultra a kind of controlled experiment.

I learn about pacing. I learn about fuelling. I learn how my body responds to heat, cold, altitude, long climbs and endless descents. I learn which equipment works and which does not. But, more importantly, I learn how I respond mentally when the race stops being comfortable.

That does not mean trying to prove that I can suffer more than someone else. I am increasingly interested in the opposite: becoming better at managing the difficulty.

Can I stay calm? Can I make a sensible decision rather than an emotional one? Can I accept that a bad hour does not necessarily mean a bad race? Can I keep working through the process when the finish line is still many hours away?

Those lessons extend far beyond racing.

Ultras have taught me patience, humility and respect for preparation. They have also shown me that our limits are rarely fixed. Some are physiological, of course, but others are assumptions built from previous experience.

Every race gives me a clearer picture of where those boundaries currently sit. Then I go back to training and try to move them. That is probably the simplest answer to why I continue to run ultras.

I am curious. Curious about what my body can adapt to. Curious about how my mind responds under pressure. Curious about whether better preparation, better decisions and greater experience can take me somewhere I have not been before.

The finish line matters but what keeps bringing me back is everything I discover on the way there.

Isaac Alcaide