Is there any health benefits with being very muscular with large muscles?

MUSCLES: EXERCISE IS GOOD For health. That is how you make muscles unless you are using anabolic steroids which can have their own side effects. if you do it the right way, its good for you.

Increased Metabolism: Yes! Your resting metabolic rate is higher when you have a greater percentage of your weight contributed to by increased lean body mass. That includes muscle and bone. There is also evidence that increased muscular strength corresponds to longevity and quality of life. It is truly survival of the strongest.