I swim twice a week, with the basic goal "do not die as soon".
I swim because it's the one exercise I will actually sustain for long periods. (I have cranky lungs, and walking gets complicated: I worry a lot I will go too far and have trouble getting home safely, and I turn out to find treadmills really tedious. Swimming, I just have to make it to the end of the pool, and I can modulate the intensity stroke to stroke if I really want to.)
I swim twice a week because there's a certain amount of associated fussing with clothing and showering after (long hair, so even with a swim cap, the chlorine needs to come out). And because I exercise before work, and I can only get myself out of bed at 5:30 (so I can leave for the pool at 6, swim from 6:30 to 7, be at work by 7:30) so many days a week.
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I swim because it's the one exercise I will actually sustain for long periods. (I have cranky lungs, and walking gets complicated: I worry a lot I will go too far and have trouble getting home safely, and I turn out to find treadmills really tedious. Swimming, I just have to make it to the end of the pool, and I can modulate the intensity stroke to stroke if I really want to.)
I swim twice a week because there's a certain amount of associated fussing with clothing and showering after (long hair, so even with a swim cap, the chlorine needs to come out). And because I exercise before work, and I can only get myself out of bed at 5:30 (so I can leave for the pool at 6, swim from 6:30 to 7, be at work by 7:30) so many days a week.