Is swimming enough as a whole-body exercise?

I have been doing slow laps for 40 min a day keeping my arms and legs moving constantly.To challenge myself, I have added time, more laps, and speed. I have never been into exercise because there's not many things I like to do but I do enjoy swimming.I don't want to push myself too hard because other times I've given up on exercise programs when I've done too much too fast. When I'm done doing my laps, I feel like I've had a good workout.Is that enough? Or am I missing toning some areas? I've thought about alternating with some weights or resistance training. What more can other exercises do for me? Any other ideas or advice?

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