Reading books is also good exercise for the brain. (Tell this to the friends who spend all their time at the gym.) When I haven't had time to read in a while, I get tongue tied, and can't think of the word I'm looking for. When I've been flying through a bunch of books, I have lots of words available in my brain!
Oh, and it also exercises in that it helps keep Alzheimer's at bay.
So tell your friend that you are exercising the grey matter!
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