I’m a fat guy but have had stretchmarks and i think i will end up with a lot of loose skin if i lost all my weight. I’m 21 and my skin could be alright but i don’t think so. I don’t mind being big but i don’t want it to be flabby so what are the best ways to harden my rolls into a nice round man belly? I need to be careful not end up with loose skin!
Do exercises that focus on your core.

Do exercises that focus on your core.
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The loose skin will eventually go away. Dont use the worry about the loose skin to not lose the weight.
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Of course you will have a lot of loose skin when you lose to much fat too fast. However your skin will become normal very soon, just try not to lose fat too fast and your skin will be ok.
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http://www.fatloss4foridiots.com/