Summary
Connects Claude to the musclesworked.com API for exercise and muscle data. You get six tools: look up which muscles an exercise hits (primary, secondary, stabilizer), search 856 exercises by target muscle or equipment type, analyze full workouts for coverage gaps and imbalances, find alternative exercises ranked by muscle overlap, and search both exercises and muscles by name. The workout analysis tool is the standout here. Tell it your routine and it maps out what you're hitting, what you're missing, and where you might be creating imbalances. Requires an API key from musclesworked.com. Useful if you're building fitness apps, planning programs, or just want Claude to understand exercise mechanics beyond generic advice.
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musclesworked-mcp
MCP server for the musclesworked.com exercise-to-muscle mapping API.
Connects Claude Desktop, Claude Code, Cursor, and other MCP clients to 856 exercises and 65 muscles with detailed primary/secondary/stabilizer activation data across 14 muscle groups.
Setup
Get an API key at musclesworked.com/dashboard.
Claude Desktop
Add to your claude_desktop_config.json:
{
"mcpServers": {
"musclesworked": {
"command": "npx",
"args": ["-y", "musclesworked-mcp"],
"env": {
"MUSCLESWORKED_API_KEY": "mw_live_..."
}
}
}
}
Claude Code
claude mcp add musclesworked -- npx -y musclesworked-mcp --api-key mw_live_...
Or add to .mcp.json:
{
"mcpServers": {
"musclesworked": {
"command": "npx",
"args": ["-y", "musclesworked-mcp", "--api-key", "mw_live_..."]
}
}
}
Cursor
Add to .cursor/mcp.json:
{
"mcpServers": {
"musclesworked": {
"command": "npx",
"args": ["-y", "musclesworked-mcp"],
"env": {
"MUSCLESWORKED_API_KEY": "mw_live_..."
}
}
}
}
Tools
| Tool | Description |
|---|---|
get_muscles_worked | Get primary, secondary, and stabilizer muscles for an exercise |
find_exercises | Find exercises targeting a specific muscle with optional filters |
analyze_workout | Analyze a workout for coverage, gaps, and imbalances |
get_alternatives | Find alternative exercises ranked by muscle overlap |
search_exercises | Search exercises by name to discover IDs |
search_muscles | Search muscles by name to discover IDs |
Example Prompts
- "What muscles does the barbell bench press work?"
- "Find bodyweight exercises for my chest"
- "Analyze my push day: bench press, overhead press, tricep pushdown, lateral raise"
- "What are some alternatives to barbell squats?"
- "Search for exercises that target the hamstrings"
Configuration
| Option | Description |
|---|---|
--api-key <key> | API key (or set MUSCLESWORKED_API_KEY env var) |
MUSCLESWORKED_API_URL | Override base URL (default: https://musclesworked.com) |
Development
git clone https://github.com/csjoblom/musclesworked-mcp.git
cd musclesworked-mcp
npm install
npm run build
# Test with MCP Inspector
MUSCLESWORKED_API_KEY=mw_live_... npx @modelcontextprotocol/inspector node dist/index.js
License
MIT
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →Configuration
MUSCLESWORKED_API_KEY*secretYour MusclesWorked API key (get one at musclesworked.com/dashboard)