Last updated July 31, 2026
FitHarness is not affiliated with, endorsed by, or sponsored by Anthropic, PBC or Claude. “Claude” is a product of Anthropic; it is referenced here only to describe how FitHarness works. FitHarness records and organizes your fitness data — it does not generate the coaching or recommendations you receive through Claude.
FitHarness is a system of record. It stores, organizes, analyzes, and visualizes the training, conditioning, nutrition, body, and recovery data you choose to log. It also acts as a transit layer — a connector — between that record and Claude, the AI assistant made by Anthropic, so you can log and review your data by conversation.
The app applies its own arithmetic and guardrails to keep the record consistent — macro reconciliation, estimated one-rep-max, progression limits, volume accounting, and injury constraints. That is bookkeeping, not coaching.
FitHarness does not create training programs, nutrition plans, coaching, or recommendations. When you connect Claude and ask it to design a block, suggest a meal, or adjust your training, that guidance is generated by Claude — an independent, third-party product operated by Anthropic under Anthropic’s own terms and policies. FitHarness does not author, review, endorse, verify, or take responsibility for any plan, statement, or recommendation Claude produces. We are a conduit and a ledger, not the coach.
FitHarness and its operator are not affiliated with, partnered with, endorsed by, or sponsored by Anthropic, PBC, and this app is not a product of Anthropic or Claude. Any references to Claude describe interoperability only. Your use of Claude is a separate relationship between you and Anthropic, governed by Anthropic’s terms and privacy policy.
Nothing provided through FitHarness or through Claude is medical, health, dietary, or other professional advice. Exercise and dietary changes carry inherent risks. Consult a qualified physician or licensed professional before beginning or changing any exercise or nutrition program — especially if you have a medical condition or injury, are pregnant, or are taking medication.
AI-generated content can be inaccurate, incomplete, or inappropriate for your situation. Always apply your own judgment and verify anything before acting on it. Do not rely on AI output for decisions that affect your health or safety.
You use FitHarness and any AI-generated guidance at your own risk. To the maximum extent permitted by law, the operator of FitHarness is not responsible or liable for any injury, loss, or harm resulting from any training program, nutrition plan, or recommendation — whether generated by Claude or created by you — or from your reliance on any content in the app. See our Terms of Service for the full terms and limitation of liability.