I think that writing down what you want to do at retirement BEFORE you retire is very important. There is a link under "Lifestyles in Retirement" about "Things to do Before you Die" that follows that logic and I think is a very important part of any ER plan.
I like your idea of taking care of your physical well-being as well as your financial well-being since one purpose of FIRE is to be healthy enough to enjoy it.
I have such a written plan and find myself doing some of the things on my list since I am already partially retired and adding to that list almost as quickly. I don't get bored because I have lots of interests. I like reading, traveling, cooking, listening to and playing music. I want to climb mountains, catch even bigger fish, scuba dive, walk on a glacier, go deer and turkey hunting, drive cross-country, and hundreds of other things. I've gone deep sea fishing many times, but now I want to learn about fly fishing and give that a try. I've travelled to many tourist hot-spots, but now I want to find those hidden gems that don't attract many tourists.
IF you cannot write enough things down to do at retirement or find yourself feeling bored about your life after working, it may mean that your job has caused you to lose interest in life. I know people like this. No matter how hard I try with some people, they are locked into their work. They say things like "I can't go on vacation because nobody can fill in for me" or "I've worked doing the same thing for XX years and it's all I know" or "If I don't go to work, I feel useless." These people have a million reasons why they can't stop working when they need only one reason why they should ER.
I remember being in stressful situations at work and wishing I were sitting on an island with a fishing pole by myself next to a blue lagoon with only the sound of ocean waves. The dream of making that wish a reality is what gives me the drive to ER and I know the nightmare of returning to the stress of work will keep me in ER.