Muscle Setup is a script for 3ds Max from developer Poker. It sets up either a bone or a cylinder with a flex modifier between two points, based on the option you pick.
Getting it running takes a drag and drop into 3ds Max. After that, the script sits under the Toke Scripts category, where you can access it. It ships as an .mcr macroscript file.
This entry is listed at version 1.00 and is free here in the catalog. A demo video is available, and the developer's page carries additional details. The developer publishes it through Toke's Blog. Muscle Setup earns its place in the scriptspot library as a small, single-purpose utility for creating a bone or a flex-modified cylinder between two points.