EMS is an open-source toolkit for Electrical Muscle Stimulation.
If you receive an error similar to _rehamovelib.so' (mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64')), you can use conda to create a virtual environment with osx-64 environment (thanks Alicia Chun for catching this, and see this Stack Overflow post for how to do it).