Alright, well basically my brother came around today and said the same thing I'd been saying the last few days "how do you almost weigh the same as me?"

My brother has way more muscle mass than me, and low bodyfat aswell as being taller, but he only weighs about 9-10lbs more than me max.

I don't understand how this is possible. He has 16" arms for example wich look twice the size of mine.

Isn't muscle meant to weigh more than fat? Cause he has more muscle, is taller and leaner than me so what's with the weigh difference? Either I'm heavy for my size or he's just light. Can you have heavier bones or something?

If any one has seen anything like this please gimme some answer, cause I'm confused here!