Claude AI Makes 90-Day Plans

People are using Anthropic’s Claude to spit out 90-day home workout programs that look like paid coaching plans, and one prompt-sharing post on X has spread widely. (x.com) The post by X user Nav Toor shows a step-by-step prompt asking Claude to act like an “expert personal trainer,” collect details like age, goals, equipment and schedule, and then build a 12-week plan with progression, nutrition guidance and check-ins. The post shows 1,060 likes and 154,000 views. (x.com) Claude has the product features to make that kind of setup sticky. Anthropic said its Projects tool lets users save custom instructions for a specific role or industry, and its help center says Projects are available to free users, with a limit of five projects on free accounts. (anthropic.com) (support.claude.com) Anthropic’s help center also says users can upload documents, text files or code into a project knowledge base and reuse that material across chats. That means someone can keep a standing “trainer” project with saved rules, past workouts and reference material instead of starting from scratch each time. (support.claude.com) The appeal is partly cost. Recent pricing guides put a typical U.S. personal-training session in a broad range from about $40 to $120, with premium trainers charging more, while Claude’s project features are available even on free accounts. (blog.trainero.com) (support.claude.com) Fitness experts are also describing AI workout planning as a real consumer use case, not just a gimmick. U.S. News reported on April 10 that chatbots can generate tailored workout content quickly if users give specifics like age, goals, equipment and injury history. (health.usnews.com) The same experts are drawing limits around that advice. U.S. News said artificial intelligence should be treated as a complement to a qualified fitness professional, not a replacement, and warned that chatbots can hallucinate made-up resources or unsafe guidance. (health.usnews.com) The American Heart Association struck a similar note in January. It quoted Columbia exercise physiologist Dr. Keith Diaz saying a chatbot-built running program aligned with what he would expect from a paid coach, while University of Michigan kinesiology professor Laura Richardson said chatbot advice for beginners could still come out “cookie cutter.” (heart.org) Published research is more cautious. A 2024 peer-reviewed review in Biology of Sport said AI-generated exercise prescriptions create new opportunities for individualized plans, but the authors said efficacy and validity have not been thoroughly investigated, especially for people with different health conditions. (pmc.ncbi.nlm.nih.gov) That leaves Claude in a role somewhere between search engine, template library and low-cost coach. The new twist is that people are no longer just asking for a workout—they are building repeatable trainer personas that can keep issuing week-by-week plans from the same chat window. (anthropic.com) (support.claude.com)