I have had Crohns most of my life. Two major surgeries 27 years apart with long periods of remission. I started riding my Bike a few years ago after my last major surgery. I started riding to be able to do something as I was advised to not run(major piece of mesh keeps my insides together after my last surgery). I am now 58 so age will play a factor in my recovery process as well.
For the last three years I have been using Trainer Road. I found getting started on a trainer to be very very hard. I had a weak core to work on…and had been seriously ill for a number of years. Muscles needed a lot of time to adapt. I rode fairly consistently 2-3 times a week at the start. Muscle recovery/tightness were what I struggled with. Taking food early on my rides did make a difference in how I handled the 50 -90 minute timeline. Increasing muscle endurance was my biggest challenge.
A year ago I was regularly going to physio to deal with the tightness and aches I would get. Doing various exercises to deal with muscle imbalance helped. This year the riding was a lot easier. Muscles finally are not getting hurt from my riding. Cardio has improved significantly. Rides that I used to find impossible to deal with are now able to be completed. For example riding at 120% FTP for the required interval was something I just couldnt do as the intervals progressed The trainer would lock up as I couldnt maintain the cadence in Erg mode. A combination of greater muscle strength and cardio now make them able to be done.
For me riding every second day is fine. Riding back to back days ie Saturday and Sunday is what I avoid as I would often just ride too hard and get myself hurt.
If I do get tired I will skip a day. The hardest thing at times to do is get on the bike and stop as you realize you are only going to hurt yourself.
As to the disease itself. I changed my food roughly when I started to ride. I removed sugar from my diet and tend to eat more non processed foods. My crohns disease doesnt let me eat a lot of leafy vegetables and roughage. I have found that ensuring I eat protein at each meal is critical to my recovery and well being.
I also changed my sleep habits and now consistently get 7-8 hours of sleep vs the 5-6 I used to function on.
If you have any specific questions re the disease/riding dont hesitate to ask.