Can someone answer me questions I have about working out ? 😊

Can I exercise at home with no equipment and see progress?

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Do I have to eat healthy and less also ?

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I’m skinny, but want to build the glutes area (I’m flat) what do I have to do ? (Protein,exercise etc?)

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I don’t want to lose weight because I’m already skinny but just want a flat stomach, what can I do?