Can ectomorphs tone up their body just by exercise alone?

It's a Secret

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or do they have to get on a diet as well as mesomorphs and endomorphs. If they do, I'm sure they'll be on a gain-weight diet not a lose weight diet, right?

I hope they can tone up just by exercise. I'm going for Debbie Sieber's Slim in 6. And as much as I want to follow everything said on the package, it's more on weight loss but I'm more in need of a weight gain. I'm really thin If I have to say.
 
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