Accessing the subset of forces that are muscles should force a rebuilding of the muscle list.
Accessing the subset of forces that are muscles should force a rebuilding of the muscle list.

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core