원래 이름 기록: LF Bolt Corp.

Described herein are electrical muscle stimulation (EMS) apparatuses (e.g., devices and systems, including suits, controls, etc.). Also described herein are EMS configured to determine one or more indicators of muscle density, and method of using them. Also described herein are EMS apparatuses and methods of using them for treating one or more of: arthritic pain, hypertension, and/or paralysis.