Aratosbung said:
I can't do yoga or anything out loud because my parents are going to come and see it. How can I do that?
Use your own common sense here, nobody knows about your circumstances, environment etc.
Generally speaking, vibrations do empower your meditations by a lot, however, you donโt necessarily have to do them. Even just visualisation, intention and focus are enough to empower your soul.
You can still do yoga, if you can lock the door in your room.