Im so thin. Is there any special exercises to be fat? Specially for hands and legs?

This is what I do, I use my hands to stuff donuts, cookies, candy into my mouth and ONLY use my LEGS to go get them. Works great. :D

I'm kidding obviously... but I couldn't resist responding.

But I think what you are looking for is an exercise to build muscle, not fat. Exercise won't help make fat. Taking in more calories than your body burns will.

You need to incorporated resistive exercise and incorporated more clean protein in your diet. Egg whites are the best protein. ClassyT is right you need to build muscle. Don't be afriad that you will look like a muscle head it doesn't work that way. Good luck.