Jo, the short answer is the one gemma gave you: normal daily activity does not reduce the chance of an embryo implanting, and strict bed rest is not recommended. If anything, prolonged immobility has its own downsides. So please do get up.
A bit more detail, because the list you have collected is a mix of three different things. Some of it is genuine clinic instruction: keep taking your progesterone exactly as prescribed, take any other medication you have been given, and follow whatever your own unit told you at transfer. That part matters and is not folklore. Some of it is sensible general advice that would apply to anyone hoping to be pregnant: not smoking, keeping alcohol out of it, and being sensible about caffeine, all of which is reasonable and none of which is about this specific fortnight. And a large part of it, bed rest, pineapple core, warm feet, avoiding a moderately heavy shopping bag, has no good evidence behind it at all.
On the specific ones you listed: very hot baths, saunas and hot tubs are worth avoiding, mostly on general early-pregnancy grounds rather than because of anything peculiar to a transfer. Exercise you already do is fine; a brand new punishing regime started this week is not the moment. Sex is a question for your own clinic, because advice varies with what your unit does and, for example, whether you had a lot of follicles and any concern about OHSS, so ask them rather than the internet. And stress: the honest position is that the everyday stress of this fortnight is not what determines your result, which is worth knowing because "relax and it will happen" is both untrue and unkind.
The things I would actually ask you to act on are the boring ones. Take the medication. Do not test early, wait for the date your clinic set. And if you get severe abdominal pain or swelling, breathlessness, or heavy bleeding, that is a phone-the-clinic situation the same day, not a wait-and-see one. Our guide to the two-week wait covers the rest.