I just did squats with 9 pound dumbell weight either side and can't do more than 5 each side im so out of breath how do I get better?

So I can do more? It kills me

I'm not super overweight but I dont exercise

Trying to lose 14 pounds

I just did squats with 9 pound dumbell weight either side and can't do more than 5 each side im so out of breath how do I get better?
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