> because it computationally is a very hard task for the brain
No they didn't say harder, they said it uses "more computation", there's a difference.
Your brain has many parallel systems specialized for exercise, because our ancestors have used similar systems to move their bodies for eons. Exercise fires all these systems in parallel, so your brain is getting great "throughput".
On the other hand stuff like Sudoku is using a much smaller fraction of our brain that developed recently, probably for language, and then trying to use the language part to do math, which feels "difficult" precisely because we're trying to do it with just a small, unspecialized part of our brain, instead of a bunch of specialized parallel systems.
So exercise is both "easier", but also more efficiently gets your brain working because of parallelism.
No they didn't say harder, they said it uses "more computation", there's a difference.
Your brain has many parallel systems specialized for exercise, because our ancestors have used similar systems to move their bodies for eons. Exercise fires all these systems in parallel, so your brain is getting great "throughput".
On the other hand stuff like Sudoku is using a much smaller fraction of our brain that developed recently, probably for language, and then trying to use the language part to do math, which feels "difficult" precisely because we're trying to do it with just a small, unspecialized part of our brain, instead of a bunch of specialized parallel systems.
So exercise is both "easier", but also more efficiently gets your brain working because of parallelism.