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Weird. Recently started running again. Went for a very intense yesterday. Spent most of today enervated, useless, out of focus. Went for another, longer run and snapped hard into clarity. From annoying stream-of-half-consciousness thoughts to abiding stillness.
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I assume there's some physiological explanation, but I'm not well-enough educated on that to know what it would be.
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I gather you are experiencing something that approximates to "runner's high". I get that effect as well. in dharma related terms that might be: virya then piti and sukha, and then equanimity (upekkhā).
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