>>166009
>I want to gain fat but only on my arms and legs
That isn't how fat works. You can't spot-increase or spot-reduce fat, your body distributes it however it does.
*drags cigar and puts it out on ur brain*
If you want to fill out your arms and legs you're better off working out and bulking. Muscle doesn't increase ANYWHERE close to as fast as you think and it will fill your frame out more.

You will not look like Ronnie Coleman by accident, you won't even be "muscular" by accident, but it will b a start.