Strictly speaking, this question may be a bit tangential to LessWrong, but this was never supposed to be a exclusive thread.
The answer will depend on a lot of things, mostly specific to you personally. Bodies differ. Even your own single body changes over the course of time. You have certain specific goals and values, and certain constraints.
Maybe what you're really looking for is recommendations for a proper physical fitness forum, which is relatively free of pseudoscience and what they call "woo." I can't advise, myself, but I'm sure that some LessWrongians can.
I think you've taken the wrong meaning of the words "work out".
This is for anyone in the LessWrong community who has made at least some effort to read the sequences and follow along, but is still confused on some point, and is perhaps feeling a bit embarrassed. Here, newbies and not-so-newbies are free to ask very basic but still relevant questions with the understanding that the answers are probably somewhere in the sequences. Similarly, LessWrong tends to presume a rather high threshold for understanding science and technology. Relevant questions in those areas are welcome as well. Anyone who chooses to respond should respectfully guide the questioner to a helpful resource, and questioners should be appropriately grateful. Good faith should be presumed on both sides, unless and until it is shown to be absent. If a questioner is not sure whether a question is relevant, ask it, and also ask if it's relevant.