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Not all exercise is the same when it comes to brain benefits. Moderate to hard endurance exercise makes your brain secrete BDNF. And you need to perform it at least 3 times a week for 20-30 min minimum to notice any benefits.

Strength training on the other hand does nothing for your brain.

See "Bran Rules" talk by Dr. John Medina @Google:

https://youtu.be/IK1nMQq67VI



Thanks for pointing this out! I've been only doing strength training for the last year and been wondering why I haven't felt as sharp as when I ran somewhat regularly.




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