Partly a copy of another answer from me, but, her my 2ct
An LLM is a language model, not a world model. It generates probabilities, not truths. It understands neither your situation nor your goals. It only recognizes statistical patterns in texts and generates what has frequently occurred in similar contexts. It only generates plausible sentences. They also often reflect what you want to hear. It definitely reinforces your tendencies, even if they are destructive. An LLM can also tell you something wrong with absolute conviction without realizing it.
An LLM, on the other hand, can help you sort through your training data and notes and put them into a different textual form. It can summarize training logs or describe trends. If you don’t understand a concept related to training or nutrition, an LLM can explain it to you in simple language. It can also be motivating, thanks to its positive phrasing.
But it’s also often used to create workouts and plans. Can an LLM create workouts? Maybe. An entire training plan? Maybe, maybe not. An LLM does not know how to control progression. How much volume should it increase, how should intensity be distributed, periodization, regeneration, what do sensible workouts look like?
Mostly this is doner per rules „behind the scenes“. Strict limits must be set for LLMs so that they do not generate nonsensical workouts. If you let the LLM decide, I’m not sure if it will always come up with the best workout choice.
Regarding the fitness chart. It‘s just a model. No model and no LLM know if your feeling tired. If you feel like you need a rest, then rest! If you feel good for a hard workout, do it! Also look in the guide for the fitness chart explanation