That might be partly explained by it, my gym sessions&#x2F;interval runs don&#x27;t last more than 30-35 minutes.<p>But I also do plenty of stuff in mountains - hikes, alpinism, ski touring, climbing etc. These are 3-10 hours activities (apart from short&amp;intense burst while climbing), similar to slow running (sometimes actually pretty intense). These could be classified as some sort of &quot;high&quot;, but more in a sense of euphory, joy of being in nature, seeing some amazing places, random meetings with animals etc. But nothing comparable to other &quot;high&quot; states from drugs. Just 2 very different worlds, both amazing but for different reasons.