MusclesWorked

Overview

MusclesWorked is a Model Context Protocol server that maps exercises to the muscles they target. With a database of 856 exercises across 65 muscle groups, it helps analyze workouts and suggest exercise alternatives. The server exposes this data as tools that AI assistants can invoke directly, making fitness-focused analysis accessible within your AI workflow.

The server runs locally via the npm package musclesworked-mcp, communicating over stdio on your machine. You'll need to set the MUSCLESWORKED_API_KEY environment variable to authenticate. Version v0.1.0 is available under the MIT license, with source code maintained at csjoblom/musclesworked-mcp on GitHub.

MusclesWorked is listed in the AI & Agents category and works with MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you're the maintainer, claim this listing to verify ownership and keep the information up to date.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "musclesworked": {
      "command": "npx",
      "args": [
        "-y",
        "musclesworked-mcp"
      ],
      "env": {
        "MUSCLESWORKED_API_KEY": "<musclesworked-api-key>"
      }
    }
  }
}

Requires MUSCLESWORKED_API_KEY