I used to do strength and endurance exercises when I bought a lot of pbooks (carry books from shop to office, then from office to home in the rush hour).
Now, though, I mostly do speed and agility, when I run around flapping because I can't remember where I put my reader down. And the occasional hill running when pbooks from Amazon turn up and I'm upstairs (there is a very short timeframe to get to the door before the delivery man assumes you're not it - usually two seconds after ringing. Sometimes he's more efficient and has the card already written and just puts that through the door instead of ringing...)
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