Because everyone in my clan can gain weight but me! it makes everything really difficult for the techniques we use.

Oh all kinds of stuff! Check this out! [He does a few hand seals and poof! He makes an illusionary copy of himself. And by "copy" I mean something that looks similar to this but more Luffy-ish looking. He is HORRIBLE with any jutsu that involves illusions.] See! it's a copy of me.