If your co-worker thinks that vacation involves lying on a beach, then I guess they don't need to train for it.
But if your plans call for a more active vacation, then I think it is just total common sense to train for it.
Personally, I love to go backpacking in the wilderness for 2 weeks. If I didn't train for it, some of the mountain climbs would kill me.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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