Mike 2 has a Full Body morph for four diff types of muscularity, "Thin", "Heavy(fat)", and "Emaciated"... by mixing these morphs, you can simulate a very wide variety of body types. As an example, I have a MOR pose file for Mike 2 in Freestuff I did as a self- portrait, which has the Thin morph set to "1" and one of the Muscular morphs set to "0.25",with the end result a slender but athletic build. Not truly muscular, but fit.

Remember, kids! Napalm is Nature's Toothpaste!