@markus_marthaler: Most swimmers think they need more fitness to swim longer distances. What they actually need is a better relationship with discomfort. Fitness is a physical ceiling. Discomfort tolerance is a mental one. And for most swimmers, the mental ceiling is hit long before the physical one. The breathing gets slightly hard, the arms feel slightly heavy, the pace feels slightly too fast to hold, and the brain starts negotiating. Slow down. Take a rest. This is too much. The body at that point is not done. It is uncomfortable. Those are not the same thing. Distance swimming is a long conversation with discomfort. The swimmer who improves fastest is not the one with the biggest engine. It is the one who can stay present and keep the technique together when everything starts to feel hard. The catch that was clean at the start of the set, the rotation that was deliberate in the warm-up, the exhale that was full and controlled at the beginning of the session. Holding all of that together when the body is asking to quit is where real improvement lives. The practical tool is simple. When discomfort shows up, do not negotiate with it. Narrow the focus. One thing. The next stroke. The next breath. The next length. Not the rest of the set. Not how far there is still to go. Just the next one. Distance is not built by being comfortable. It is built by getting comfortable with being uncomfortable. What is the moment in a set when your brain starts negotiating? Tell me in the comments.