Any good start workout videos on youtube?

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I really want to do zumba workout but I feel like I'm not quite ready for that yet. lol. I'm 315 pounds so I'm not sure what I should start at.

I'm not terribly out of shape to where I have to take a break every 10 minutes or anything. I can do a good 30 minutes without stopping. I can move pretty fast, too.

Anyone have any recommendations?