Is jogging on the treadmill good enough to stay in shape?

I'm a thin woman and would like to be a bit more active mostly for health reasons and to stay in shape, not so much to lose weight. I've never been into working out but love swimming during summer. There's a gym in my compound and I would like to start using the treadmill and do at least 10.000 steps per day.

Is jogging on the treadmill good enough to stay in shape?
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