Mountain bikers knew this moment long before science gave it a name: flow. Psychologist Mihaly Csikszentmihalyi coined the term in 1975. It describes the complete fusion of action and consciousness, the silencing of all worry. We all know how good that feels. But the price often goes unmentioned.

Flow is a drug

The rush of flow is real; the body generates it itself. Neuroscientist Arne Dietrich calls this mechanism transient hypofrontality: maintaining balance, reading the pace, reacting in real time. This demands so much of the brain that it shuts down the areas responsible for rumination, planning, and self-observation. The inner critic falls silent. At the same time, a cascade of the body’s own neurotransmitters floods the system: dopamine, norepinephrine, endorphins, anandamide. The body itself activates the very same receptors that exogenous intoxicants bind to. And that is why the brain craves this state again. Not someday. Soon.

The dose must increase

Csikszentmihalyi formulated a condition for flow: challenge and skill must be in balance. As skill increases, the same route becomes boring. If you want to stay in flow, you have to step it up: steeper, faster, more challenging. What begins as healthy progress always ends at the same point: you want more. The old dose no longer works.

Sound like addiction? In 2009, Sarah Partington and her team interviewed fifteen elite surfers who conquer the world’s biggest waves. The surfers reported the joy of being in the flow and, in the same breath, symptoms familiar to any addiction specialist: loss of control, ignoring danger, and the narrowing of life down to that one thing. If the wave failed to materialize, irritability and emptiness set in. Withdrawal.

This doesn’t apply only to surfers. Studies of endurance athletes regularly show significantly higher rates of sports addiction than in the general population, though estimates vary widely depending on the measurement method. Mountain biking rarely appears in such studies, but that doesn’t exclude it.

The warning light turned off

Here the circle closes. The dangerous one. At the very moment the flow demands more risk, it takes away the ability to see that risk. In 2013, Julia Schüler and Jeanne Nakamura demonstrated how this works in studies with kayakers and climbers: The flow heightens the sense of one’s own efficacy. One experiences oneself as competent, confident, and flawless. This euphoria suppresses risk perception. Those deeply immersed in flow underestimate the danger and ride more recklessly. Precisely when it matters most.

The key factor is who it affects. Experienced riders correct their course intuitively; their bodies carry patterns stored over years of practice. For the less experienced, this correction fails. They overestimate their limits the most and crash precisely when they feel safest. The warning light doesn’t come on because the power is off.

That’s the trap: not that flow can be addictive, but that it paralyzes the mechanism that would protect against escalation. No one has to stop riding because of this. Flow is a gift. You just mustn’t confuse it with life. The next descent feels like always. Only faster. The next dose.