"There are estimates that we daily walked for 10 - 20 kilometers for hundreds of thousands of years. The world's best problem solving machinery grew up under conditions of consistent, strenuous physical activity. It makes sense that when we don't recreate the environments in which the organ was forged, we get a loss of function. And that when we do restore those environments, we get that function back. The effects of aerobic exercise on executive function skills is a powerful empirical example of this idea."

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In matter-ism (materialism), there can be nothing wrong with the world since there is no right way for the world to be in the first place. Everything is just matter in motion and that's that. In Mind-ism (monism) there's a different route to the same problem. There cannot be a problem of evil, even in principle, since in Mind-ism even morality is maya; illusion. In neither story, then (if we're to be consistent with their principles), can the issue of evil be raised. But in real life the problem comes up all the time. That's the difficulty.

— Greg Koukl