http://www.englishforums.com/English/SwimmingIsAGoodExercise/cjdmb/post.htm
It strains the limits, Teo, at least in my opinion!
I think of "an exercise" as some particular movement designed to be repeated
so as to strengthen a muscle or particular group of muscles.
A good exercise is to do bicep curls.
The bench press is a good exercise.
Swimming is a good way to get (some) exercise.
I don't see swimming as specific enough to be an exercise.
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