I swim about once a week. When I first started swimming, I saw noticeable cardiovascular improvement from one workout to the next. I could literally swim farther with less effort and could even run faster on the treadmill each week that I swam. It is the only exercise I've done where I saw marked improvement like that from one workout to the next. I've definitely seen improvement with the other types of exercise that I do, but it's take a lot longer.
I don't think the swimming has really done much for me in terms of building muscle ("toning") or increasing my strength. For that, you really need to be doing strength training. Because swimming is non-weight bearing, I don't think you're really going to see much improvement from it in terms of strength. Maybe some, but it's really more of a cardiovascular exercise.
At this point, I've plateaued with my swim workouts, so I'm not seeing much further improvement from them. But I'm not really working at it either. If I were doing more timed sets and other drills, I'm sure I'd see further improvement. But swimming is the easy day in my workouts, so I'm not really worried about pushing myself at it.
I find swimming to be very therapeutic. The rest of the exercise I do is very high intensity--HIIT, plyometrics, and heavy lifting. I'm often sore from it. I'll start a swim workout sore and often feel better afterwards. I think being in the water helps.
Right now, I do 120 laps, which is almost mile and three-quarters. I have a routine that I've put together that includes a variety of strokes, some interval work, and kicking with flippers.
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