MusclesWorked — The Exercise Data Layer for Fitness Platforms
Map any exercise to the exact muscles it works. 856 exercises, 63 muscles, 7,310 mappings. MCP Server + REST API for fitness apps, AI coaches, and health platforms.
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OpenAPI Spec (preview)
{"openapi":"3.1.0","info":{"title":"MusclesWorked API","description":"Exercise ↔ Muscle Mapping API. Look up muscles for any exercise, find exercises for any muscle, analyze workout coverage, and discover exercise alternatives.","version":"0.2.0"},"paths":{"/health":{"get":{"tags":["public"],"summary":"Health","operationId":"health_health_get","responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}}}}},"/api/v1/exercises/{exercise_id}/muscles":{"get