[rrrrrrrrrrrryan]

While it's possible to enter altered states of consciousness via endurance sport, (or meditation, yoga, breathing exercises, etc). the experience is fundamentally different than ingesting psychoactive substances.

With one, you have to actively work to achieve an altered state. With the other, once you ingest the thing, it's happening whether you want it to or not.

One is an act of willful exertion, the other is an act of surrender.