Basemesh muscle is controlled by the layer, 0 is anorexic body-type, 1 is extreme bodybuilder body-type, you can play with the numbers to achieve whatever body you like. Model is split into polygroups for easier sculpting. Topology is 100% quads, and it has UVs.
Lowest subdivision has 2636 polygons.
This is Zbrush only, 2018 version.