The book "Deep Work" contains a chapter on memorisation which recommends a few methods (memory palace etc.) and a few exercises (memorise a deck of cards) etc.

The book "Deep Work" contains a chapter on memorisation which recommends a few methods (memory palace etc.) and a few exercises (memorise a deck of cards) etc. It starts off with an interesting story about an acquaintance of the author who was memorising iirc The Torah. My wife's late grandfather used to spend a lot of time memorising religious scripture and solving mathematical puzzles and coming up many by himself. He was extremely sharp till the second of his death. Very articulate and completely aware of everything. I've come to think of memorisation as mental exercise that spills over into other "parts" of the brain and generally functions as something to "keep you young".