Does anyone know specific aerobic exercises?

demonology
I want to do aerobic exercise.

Not jogging, since I don't feel safe leaving the house alone, and I don't want to burden people asking to go out with me.
Nothing related to jumping jacks, since I live on a top floor and don't want to shake the building.
I've been thinking about yoga, but is that really areobic exercise?
I have stairs I can use, is that a good option?

Basically, do you know any aerobic exercise that I can do relatively in place without jumping or running?
Does anyone know specific aerobic exercises?
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