Being skinny is not all. Benefits of growing volume when volume comes from muscle instead of fat, out-weight the benefits of being skinny.  

It has a very simple reason, skeletal muscle secrets potent hormones and molecules. And because the biggest muscle is on your butt, that's what you need to grow.

One of these potent hormones is IGF-1, which regulates insulin metabolism, helping to balance blood sugars, and stimulates protein synthesis. This helps you further to build more muscle.

Another amazing substance secreted by muscle is BDNF (a.k.a. brain-derived neurotrophic factor). It has a brain protecting effect and helps the regeneration of the brain.

Muscle also increases production of testosterone and HGH. Both are directly linked to cognitive functions and youth. It is also a major target of thyroid hormone signalling. Building muscle mass is a secret weapon for those with hypothyroidism.

Muscle eats fat. During any type of exercise it does so while you’re exercising....