speaking as someone that has in the past exercised a lot... its what you can manage that is the key. walking is fine - the CFS has limitations there clearly of course. You say you can walk 5-10 minutes but then need a rest. Is there a route you can take that at a pertinent distance has a bench or bus stop with a seat or similar? Then you could walk to the seat, rest, and walk back again. Now you've done 20 minutes walking! If that was possible to be done at breakfast, lunch and tea time that's an hour a day. Obvs I don;t know the limitations of your CFS so it could be that is too much, or certainly for starters, but view it is little and often rather than one big effort maybe. the key here above all else is safety - not being caught outside in the rain for example. have you a friend that could walk with you? Or a neighbour with a dog that would appreciate the exercise too (maybe an older dog rather than a bouncy 2 year old!
Do you have a house with stairs? Or a flat with communal stairs? Walking up and down those would provide exercise also, and have the benefit of being available if the weather is poor for a walk outside, and also that you are close to home should you become fatugued. If you have no stairs at home, are there any steps locally and nearby that could suffice. It wouldn;t have to be a huge amount - a dozen would probably suffice. or a suitabl;e slope even (eg wheelchair friendly paths etc).
just a couple of ideas 🙂
cheers
didds