Hi
Firstly thank you for replying back to me and second, so pleased you have made those changes and obviously seeing positive benefits.
It is, initially quite worrying after being first diagnosed who and who not to tell from friends, family and work. When you’re trying to get just the facts and internet Chronic lymphocytic leukaemia (CLL) is plastered with confusing mostly out of date USA and UK invariably contradictory and I agree scary!
Certainly sounds like you have it straight in your head and perhaps now have an approach to physically overcome the fatigue.
Really sounds like you have good support around you and are adapting your life well at the same time keeping fit.
To answer your questions.
I have kept active all my life and
after diagnosis I didn’t initially change things much continued walking the dogs and doing some sport football and a little light cycling. Xmas 2019, I watched a hospital documentary about leukaemia patients going through new blood trials. One of the patients had a similar lifestyle age etc etc to me but sadly his body could not cope with the 3rd phase of treatment. I decided that I needed to build my stamina, get fitter and lose weight. To be stronger to cope with future treatments for when the time comes if offered. I remain positive that advances continue to be made. I started from scratch
Covid then hit! Followed by instructions stay at home for the “clinically extremely vulnerable“ determined, I started static cycling everyday and doing core strengthening then as things opened up I began to run every other day eventually getting to achieve my target of a half marathon distance. I only say this as it was a step too far I “endure it” not “enjoyed it” and was far happier do 5 or 10k runs alternate days to cycling (3 days a week of each) with one day rest. Aside nursing injuries that’s what I have been doing since but hey I’m fortunate don’t have to go out to work and recover from that too!! Though of late, my recovery from Covid and this shingles thingy has scuppered me a little. I run probably once in every 5 days at present and only 5k and cycle other days. I initially lost 3+ stone (I needed to - far too many business lunches in my career!!).
The magnesium is a good idea I hadn’t thought of that.
My wife, my best friend with many wonderful qualities including being an ex nurse, keeps a keen eye on me pushing myself too soon and too quickly.
Something else you might find helpful is mindset. I have learnt more about myself in the last 3 years in learning how to push myself and what I didn’t know I was physically capable off and to not say I can’t do something more to try, that I’m only competing with myself, it’s not a race and if I’m knackered give myself permission to adjust what and how I do things. For example maybe run a shorter distance then cycle later in the day to lessen the direct impact etc.
We don’t know how long we have but not many people get given a crystal ball that helps to decide what is truly important and the time under a watch and wait system that guides us.
Oh I’m not making a bucket list yet either 
Take care
my job is quite physical, I’m a Sports Massage Therapist.