Answer:
exercise
Explanation:
Since he was a man in his forties maybe so he can get get some exercise in so he can be healthy and not get sickness since from the things you listed above he didn't do any physical activity maybe for exercise.
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Ace This Test You Got This <3
It is a pun.
This is because it is a figure of speech that exploits a word's meaning in this case that the book was impossible to put down.