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Simple Muscle
Turn your AI into your workout coach
Simple Muscle is an iPhone workout planning and tracking app built for the AI assistant you already use. Connect ChatGPT, Claude, or another compatible AI so it can create and update real workouts using your goals, preferences, and completed training history. The same workouts appear in a focused native gym experience with set logging, rest timers, exercise demonstrations, training history, and Live Activities. The core tracker also works without AI, and users do not need to pay for another proprietary AI fitness coach.